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Psychological & Behavioral Intelligence

Dais Diana Souza e Silva and Davi Silva Samaritano Allegedly Murdered by Diógenes dos Santos Samaritano, Parauapebas, Pará, Brazil

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Human-reviewed analysis

Psychological & Behavioral Intelligence

This source-based behavioral analysis does not establish a clinical diagnosis, motive, or legal finding.

Case Overview

This case involves the alleged femicide of Dais Diana Souza e Silva by her husband, Diógenes dos Santos Samaritano, in Parauapebas, Pará, Brazil. The source-grounded psychological and behavioral analysis reveals a prolonged pattern of domestic violence, including physical, psychological, and financial abuse by the defendant against the victim. The victim was subjected to escalating violence, isolation from family, and control, culminating in her death. The child, Davi Silva Samaritano, was present and exposed to traumatic events, showing psychological distress. The defendant’s behavior includes aggression, control, and attempts to conceal evidence. The victim’s family and witnesses provide consistent accounts of abuse and fear. The defendant partially confesses but attributes some memory gaps to intoxication. The forensic evidence and expert testimony strongly support the occurrence of femicide rather than suicide. The case reflects complex dynamics of coercive control, emotional abuse, and violence within an intimate partner relationship.

Relationship Dynamics

The relationship between Dais Diana Souza e Silva and Diógenes dos Santos Samaritano was characterized by chronic interpersonal conflict, physical and psychological abuse, and coercive control. The defendant exercised possessiveness and monitoring, restricting the victim’s contact with her family and controlling financial resources, forcing her to sell assets and quit her job. The victim experienced isolation and emotional abuse, with repeated injuries documented by photos and police reports. Despite attempts to separate, the victim returned due to custody concerns for their son, Davi, and hope for change. The defendant’s jealousy and aggression extended to other women, including his ex-wife. The child was used as a tool for parental alienation, with the defendant portraying the victim negatively to Davi. The victim maintained optimism and hope, preparing for public service exams and planning a better future, contradicting any suggestion of suicidal ideation. The defendant’s social conduct was reported as aggressive and intimidating, with influence in local authorities, contributing to fear among witnesses and family members.

Escalation Summary

The behavioral pathway began with early physical and psychological abuse shortly after marriage, escalating to severe injuries including a broken arm. The defendant imposed financial strain by forcing the victim to sell assets and quit work. Attempts at separation were met with harassment and threats, including isolation from family. The victim returned to the relationship under duress related to child custody. On the day before the incident, the victim was publicly assaulted at a mall, visibly injured and emotionally distressed. The fatal incident involved a physical struggle at the residence, with the victim being assaulted and thrown from a second-floor window in the presence of their young child. Post-offense, the defendant removed surveillance equipment and evidence, fled briefly but remained in the city, and eventually surrendered with legal counsel. The child exhibited trauma-related behaviors and partial recollections of the violence. The defendant confessed responsibility but claimed intoxication and memory lapses. The case culminated in a jury conviction for femicide with multiple aggravating factors.

Observed Patterns and Case-Specific Context

Each entry separates the reported behavior or state from the analytical strength of the available narration.

Behavior / construct Person / subject Detailed case context Evidence
Chronic interpersonal conflict Relationship stressor Dais Diana Souza e Silva and Diógenes dos Santos Samaritano

The victim’s sister and mother reported a very troubled relationship marked by physical abuse including broken bones, psychological abuse such as isolation from family, and financial abuse forcing the victim to sell assets and quit her job. The defendant’s jealousy and aggression were persistent, leading to repeated conflicts and violence over years.

Context or trigger: From three months into the marriage, escalating physical and psychological abuse

Reported expression: Repeated physical assaults, psychological violence, threats, and financial control

 Explicitly reported Confidence: High
Coercive control Control dynamics Diógenes dos Santos Samaritano SuspectHusband of the victim

The defendant did not allow the victim or their son to have contact with her family, isolated her socially, and exerted financial control by forcing her to sell her motorcycle, car, and quit her job. He also used threats and intimidation to maintain dominance.

Context or trigger: Control over victim’s social contacts, finances, and autonomy

Reported expression: Prevented victim and child from contacting family, forced sale of assets, restricted victim’s employment

 Explicitly reported Confidence: High
Help-seeking or disclosure Coping response Dais Diana Souza e Silva VictimWife of the victim

The victim made multiple attempts to seek help by filing police reports for domestic violence, despite interference by the defendant who used his position to prevent report registration. She communicated with her family through photos and messages documenting injuries and abuse.

Context or trigger: Repeated police reports and communication with family about abuse

Reported expression: Filing police reports under Maria da Penha law, sending photos and videos of injuries to family

 Explicitly reported Confidence: High
Fear or perceived threat Emotional state Victim’s family

The victim’s family and other women reported fear of the defendant’s aggression and influence over local authorities. Threats were made that if harm came to them, no one would know it was him. This fear inhibited some witnesses from testifying or reporting.

Context or trigger: Threats and intimidation by defendant towards family and witnesses

Reported expression: Family members and witnesses feared retaliation due to defendant’s influence and threats

 Explicitly reported Confidence: High
Depressive symptomatology Emotional state Dais Diana Souza e Silva VictimWife of the victim

Witnesses including family and friends consistently reported that the victim was happy, confident, and motivated, preparing for public service exams and planning her future. There was no indication of depressive symptoms or suicidal thoughts.

Context or trigger: Victim’s emotional state before death

Reported expression: No signs of depression or suicidal ideation; optimistic and motivated

 Explicitly reported Confidence: High
Instrumental aggression Offender behavior Diógenes dos Santos Samaritano SuspectHusband of the victim

The defendant engaged in repeated physical assaults, including breaking the victim’s arm and causing cranial trauma. The fatal act involved throwing the victim from a second-floor window after a physical struggle, demonstrating deliberate use of violence to achieve control or eliminate the victim.

Context or trigger: Physical assault culminating in victim’s death

Reported expression: Use of physical violence to control and ultimately kill the victim

 Narrative-supported psychological state Confidence: High
Premeditation and planning Planning or impulsivity Diógenes dos Santos Samaritano SuspectHusband of the victim

After the incident, the defendant removed the DVR from a hidden location in the house, which contained surveillance footage, and his lawyers retained the keys and vehicle. The victim’s cell phone and notebook were missing, indicating an attempt to conceal evidence and obstruct investigation.

Context or trigger: Removal of surveillance equipment and evidence concealment

Reported expression: Deliberate removal of DVR and disappearance of victim’s cell phone and notebook

 Narrative-supported psychological state Confidence: High
Emotional escalation Escalation Diógenes dos Santos Samaritano and Dais Diana Souza e Silva

On the night of the incident, the defendant and victim engaged in a heated argument, during which the victim scratched and slapped the defendant, who was intoxicated. A physical struggle ensued, with the defendant holding the victim’s arms and the victim sustaining injuries before being thrown from the window.

Context or trigger: Argument and physical struggle on the night of the incident

Reported expression: Escalation from verbal dispute to physical violence resulting in fatal injury

 Explicitly reported Confidence: High
Dependency or attachment insecurity Attachment-related behavior Dais Diana Souza e Silva VictimWife of the victim

The victim returned to live with the defendant after separation because of a custody dispute and social worker’s indication that the defendant had physical and financial means to raise their son. She hoped for change and prioritized her child’s welfare over personal safety.

Context or trigger: Return to abusive relationship due to child custody concerns

Reported expression: Victim’s decision to return to defendant despite abuse to maintain custody and care for son

 Narrative-supported psychological state Confidence: High
Maladaptive coping Coping response Diógenes dos Santos Samaritano SuspectHusband of the victim

The defendant consumed significant amounts of alcohol on the day before and the day of the incident, including a liter of whiskey and beers. He reported memory lapses and flashes, suggesting intoxication impaired his awareness and control during the fatal event.

Context or trigger: Alcohol consumption and intoxication on day of incident

Reported expression: Heavy drinking leading to impaired memory and possible loss of control

 Explicitly reported Confidence: Moderate
Emotional abuse Control dynamics Diógenes dos Santos Samaritano SuspectHusband of the victim

The defendant repeatedly insulted and threatened the victim and her family, including threats to kill her and harm her relatives. He used intimidation to isolate her and maintain control, including psychological manipulation and parental alienation of their son.

Context or trigger: Repeated degrading, threatening, and manipulative conduct

Reported expression: Verbal insults, threats to kill victim and family, humiliation, and control

 Explicitly reported Confidence: High
Family opposition or interference Family dynamics Victim’s family

The victim’s mother, sister, and other relatives were involved in supporting the victim, attempting to maintain contact with her and the child, and expressing fear of the defendant’s aggression. They reported the abuse to authorities and sought justice after the victim’s death.

Context or trigger: Family involvement and concern over victim’s safety

Reported expression: Family actively sought to protect victim and child, expressed fear and grief

 Explicitly reported Confidence: High
Rumination or fixation Cognitive pattern Diógenes dos Santos Samaritano SuspectHusband of the victim

The defendant repeatedly threatened the victim and her family, emphasizing his influence and power to intimidate and silence them. This pattern suggests a fixation on maintaining control and dominance over the victim and those close to her.

Context or trigger: Repeated threats and controlling behavior related to victim and family

Reported expression: Persistent focus on controlling victim and family, including threats of harm

 Narrative-supported psychological state Confidence: Moderate
Withdrawal or reduced functioning Behavioral pattern Davi Silva Samaritano Victim's son

Psychologists reported that Davi exhibited symptoms consistent with trauma, including sadness, withdrawal, nightmares, and motor agitation. He showed difficulty verbalizing events coherently, indicating psychological impact from witnessing violence and loss of his mother.

Context or trigger: Child’s psychological state after witnessing violence and loss

Reported expression: Sadness, withdrawal, nightmares, motor agitation, and emotional distress

 Explicitly reported Confidence: High

Behavioral Escalation Pathway

Select a stage to expand it; scroll horizontally to follow the full sequence.

Narrative sequence
1 Early marriage and onset of abuse Dais Diana Souza e Silva and Diógenes dos Santos Samaritano Chronic interpersonal conflict Explicitly reported

Within three months of marriage, the defendant began physical, psychological, and financial abuse against the victim, including controlling her social contacts and finances, marking the start of a prolonged abusive relationship.

Explicitly reported · High confidence

2 Escalation of violence and isolation Diógenes dos Santos Samaritano SuspectHusband of the victim Coercive control Explicitly reported

The defendant intensified control by isolating the victim from her family, forcing her to sell assets, quit her job, and restricting her autonomy, while continuing physical assaults and threats.

Explicitly reported · High confidence

3 Victim’s attempts to seek help and separation Dais Diana Souza e Silva VictimWife of the victim Help-seeking or disclosure Explicitly reported

The victim filed multiple police reports and sought protective orders, sending evidence of abuse to family members, but was often obstructed by the defendant’s influence over authorities.

Explicitly reported · High confidence

4 Return to relationship due to child custody Dais Diana Souza e Silva VictimWife of the victim Dependency or attachment insecurity Narrative-supported psychological state

Despite abuse, the victim returned to live with the defendant to maintain custody of their son, influenced by social worker’s assessment and hope for change.

Narrative-supported psychological state · High confidence

5 Public assault and visible injuries before incident Diógenes dos Santos Samaritano and Dais Diana Souza e Silva Emotional escalation Explicitly reported

On March 30, 2019, the victim was publicly assaulted by the defendant at a shopping mall, visibly injured and emotionally distressed, witnessed by staff and others, indicating escalation of violence.

Explicitly reported · High confidence

6 Fatal incident at residence Diógenes dos Santos Samaritano SuspectHusband of the victim Instrumental aggression Narrative-supported psychological state

On the night of March 30-31, 2019, a physical struggle occurred at the couple’s residence, during which the defendant assaulted the victim, held her arms, and ultimately threw her from a second-floor window, causing fatal injuries.

Narrative-supported psychological state · High confidence

7 Post-offense concealment and flight Diógenes dos Santos Samaritano SuspectHusband of the victim Premeditation and planning Narrative-supported psychological state

Following the incident, the defendant removed the DVR containing surveillance footage, took the victim’s cell phone and notebook, left the residence locked, and fled to a lawyer’s office within the city, indicating attempts to conceal evidence and evade immediate detection.

Narrative-supported psychological state · High confidence

8 Arrest and confession Diógenes dos Santos Samaritano SuspectHusband of the victim Help-seeking or disclosure Explicitly reported

The defendant was arrested in flagrante delicto at a lawyer’s office after surveillance by police. He exercised his right to silence initially but later confessed responsibility for the crime during trial, acknowledging partial memory loss due to intoxication.

Explicitly reported · High confidence

9 Child’s psychological impact and testimony Davi Silva Samaritano Victim's son Withdrawal or reduced functioning Explicitly reported

The child witnessed traumatic events and exhibited psychological distress including sadness, nightmares, and motor agitation. Through play therapy and drawings, he expressed fragmented memories of violence, indicating exposure to and impact from the domestic violence and fatal incident.

Explicitly reported · High confidence

Arrows show the sequence described in the source narrative; they do not prove that one psychological state caused the next event.

Source Limits and Cautions

The analysis is limited by the absence of direct clinical diagnoses; all psychological states are inferred from narrative-supported evidence. The child’s testimony is developmentally limited and fragmented, restricting definitive conclusions about his full experience. The defendant’s partial confession and claims of intoxication introduce uncertainty about his precise mental state during the offense. Some witness accounts may be influenced by emotional distress or bias. The forensic expert could not conclusively determine if the victim was conscious at the time of the fall. The absence of direct video evidence due to removal of the DVR limits objective reconstruction of the event. The defense’s narrative introduces alternative interpretations but lacks corroborative evidence. Overall, the analysis relies on reported facts and expert testimony without clinical evaluation or psychological testing.

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