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OSINT Case File

Psychological & Behavioral Intelligence

Sankari De and Amarjyoti De Allegedly Murdered by Bandana Kalita, Dhanti De, and others, Guwahati, Assam, India

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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 a complex interplay of interpersonal conflict, financial motives, and premeditated violence within a family context. The suspect, Bandana Kalita, reportedly engaged in a prolonged marital relationship marked by financial disputes and extradyadic attachment, culminating in the alleged murders of her mother-in-law and husband. The behavioral patterns include deception, concealment, and instrumental aggression, with evidence of planning and control dynamics. The victims exhibited situational vulnerability due to their dependence and trust in the suspect. The suspect's post-offense conduct involved impression management and detection avoidance, complicating the investigation.

Relationship Dynamics

The relationship between Amarjyoti De and his mother, Sankari De, was strained due to Sankari's disapproval of Amarjyoti's marriage to Bandana Kalita, leading to physical separation and weakened familial bonds. Bandana and Amarjyoti's marriage was characterized by chronic interpersonal conflict, primarily over financial dependence and disputes. Bandana's extradyadic attachment to Dhanti De further destabilized the marital relationship and contributed to the planning of the murders. Bandana assumed control over family financial resources following the murders, indicating financial abuse and coercive control. The family system exhibited conflict, with opposition from Sankari De toward the marriage and subsequent interference in household dynamics.

Escalation Summary

The pathway began with prolonged marital dissatisfaction and financial strain, exacerbated by extradyadic attachment and chronic conflict. Bandana and her accomplices engaged in premeditated planning involving procurement of weapons and concealment materials. The first murder targeted the mother-in-law, followed by body dismemberment and concealment. Bandana then assumed control of the household and financial assets, maintaining deception through false narratives and normal social behavior. The second murder of Amarjyoti followed a similar pattern of assault, killing, dismemberment, and concealment. Post-offense behaviors included filing a false missing person report, financial exploitation, and attempts at detection avoidance and impression management until eventual confession under police interrogation.

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
Marital dissatisfaction Relationship stressor Bandana Kalita and Amarjyoti De

The marriage lasted 12 years but was marked by daily conflicts primarily about financial issues, with Amarjyoti living off his mother's money and not working full-time, causing Bandana to become dissatisfied and seek alternative attachments.

Context or trigger: Prolonged financial disputes and Amarjyoti's unemployment

Reported expression: Frequent fights over money and lack of Amarjyoti's contribution

 Explicitly reported Confidence: High
Extradyadic attachment Attachment-related behavior Bandana Kalita SuspectWife of the victim

Bandana developed a close relationship with Dhanti De, which escalated into an affair and joint planning of the murders, indicating emotional and possibly romantic attachment outside her marriage.

Context or trigger: Marital conflict and financial strain

Reported expression: Affair with taxi driver Dhanti De and planning murders together

 Explicitly reported Confidence: High
Financial strain or dependence Relationship stressor Bandana Kalita and Amarjyoti De

Amarjyoti did not have a career and depended financially on his mother, while Bandana took up employment to manage household expenses, highlighting financial pressure and dependence within the family.

Context or trigger: Amarjyoti's unemployment and reliance on mother's money

Reported expression: Bandana working as gym instructor; Amarjyoti living off mother's rent income

 Explicitly reported Confidence: High
Chronic interpersonal conflict Relationship stressor Bandana Kalita and Amarjyoti De

The marriage was characterized by persistent conflict, including opposition from Sankari De to the marriage, leading to physical separation and ongoing disputes between Bandana and Amarjyoti.

Context or trigger: Ongoing marital disputes over money and family relations

Reported expression: Daily fights and strained relationship with mother-in-law

 Explicitly reported Confidence: High
Premeditation and planning Planning or impulsivity Bandana Kalita, Dhanti De, Arup Deka

The suspects deliberately procured tools and materials to commit silent murders and conceal evidence, demonstrating advance preparation and coordination in executing the crimes.

Context or trigger: Acquisition of weapons and materials before murders

Reported expression: Buying machete, plastic sheets, blankets; coordinated murder and disposal

 Explicitly reported Confidence: High
Instrumental aggression Offender behavior Bandana Kalita SuspectWife of the victim

The aggression was purposeful and goal-directed to eliminate victims quietly and efficiently, using suffocation and strangulation to avoid alerting neighbors and ensure death.

Context or trigger: Execution of murders by suffocation and strangulation

Reported expression: Killing mother-in-law silently; beating and strangling son

 Narrative-supported psychological state Confidence: High
Deception or concealment Behavioral pattern Bandana Kalita SuspectWife of the victim

Bandana concealed the murders by cleaning crime scenes, managing rent collection under false pretenses, and filing a fabricated missing person report to mislead authorities and community members.

Context or trigger: Post-murder management of household and finances

Reported expression: Cleaning houses, lying to tenants, filing false missing person report

 Explicitly reported Confidence: High
Financial abuse Control dynamics Bandana Kalita SuspectWife of the victim

Bandana exploited the financial assets of the deceased by unauthorized withdrawals, indicating misuse and control over the victims' financial resources for personal gain.

Context or trigger: Withdrawing money from victim's bank accounts after murders

Reported expression: Using Sankari De's debit card to withdraw large sums

 Explicitly reported Confidence: High
Co-offender facilitation Offender behavior Dhanti De and Arup Deka

The accomplices actively enabled Bandana's harmful conduct by participating in the murders, body dismemberment, and concealment, facilitating the execution and cover-up of the crimes.

Context or trigger: Assisting Bandana in murders and disposal of bodies

Reported expression: Entering houses, helping kill, dismember, and dispose of bodies

 Explicitly reported Confidence: High
Impression management Post-offense behavior Bandana Kalita SuspectWife of the victim

Bandana deliberately presented a facade of normalcy and innocence to family, community, and authorities to avoid suspicion and maintain social standing despite the alleged crimes.

Context or trigger: Maintaining normal social behavior after murders

Reported expression: Attending gym, professional exams, festivals, and temple visits

 Narrative-supported psychological state Confidence: High
Family opposition or interference Family dynamics Sankari De VictimMother of the victim

Sankari De's disapproval of the marriage created familial tension, weakening Amarjyoti's relationship with his mother and contributing to the couple's decision to live separately.

Context or trigger: Disapproval of Amarjyoti's marriage to Bandana

Reported expression: Strong opposition leading to strained mother-son relationship

 Explicitly reported Confidence: High
Situational vulnerability Victim vulnerability Sankari De and Amarjyoti De

Both victims were exposed to harm because Bandana had keys and access to their homes and controlled financial resources, reducing their ability to detect or prevent the attacks.

Context or trigger: Trust in Bandana and physical access to homes

Reported expression: Victims were vulnerable due to access and dependence on Bandana

 Analytical inference Confidence: Moderate

Behavioral Escalation Pathway

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

Narrative sequence
1 Marital and family conflict emergence Bandana Kalita and Amarjyoti De Marital dissatisfaction Explicitly reported

The marriage between Bandana and Amarjyoti was marked by persistent financial disputes and lack of Amarjyoti's employment, compounded by Sankari De's opposition to the marriage, leading to physical separation and weakened family bonds.

Explicitly reported · High confidence

2 Extradyadic attachment and conspiracy formation Bandana Kalita SuspectWife of the victim Extradyadic attachment Explicitly reported

Bandana developed an affair with Dhanti De, which evolved into a conspiratorial relationship planning the murders of Sankari De and Amarjyoti De, indicating a shift in attachment and alliance.

Explicitly reported · High confidence

3 Premeditation and preparation for murder Bandana Kalita, Dhanti De, Arup Deka Premeditation and planning Explicitly reported

The conspirators procured weapons and materials such as a machete, plastic sheets, and blankets to facilitate silent killing and concealment, demonstrating deliberate planning.

Explicitly reported · High confidence

4 Execution of first murder and concealment Bandana Kalita SuspectWife of the victim Instrumental aggression Narrative-supported psychological state

The group entered Sankari De's home at night, suffocated her silently with a pillow, dismembered her body, and disposed of it far from the crime scene to avoid detection.

Narrative-supported psychological state · High confidence

5 Post-murder deception and control Bandana Kalita SuspectWife of the victim Deception or concealment Explicitly reported

Bandana cleaned the crime scene, took control of the victim's keys and financial instruments, collected rent under false pretenses, and maintained a facade of normal life including professional activities.

Explicitly reported · High confidence

6 Execution of second murder and concealment Bandana Kalita SuspectWife of the victim Instrumental aggression Narrative-supported psychological state

Twenty-two days later, the group assaulted Amarjyoti De in his apartment, strangled him to death, dismembered his body, and disposed of it in a distant location, repeating the prior method.

Narrative-supported psychological state · High confidence

7 Continued deception and financial exploitation Bandana Kalita SuspectWife of the victim Financial abuse Explicitly reported

Following the murders, Bandana withdrew large sums from the victims' bank accounts, rented out the apartment, and discarded evidence such as the murder weapon to avoid detection.

Explicitly reported · High confidence

8 False missing person report and impression management Bandana Kalita SuspectWife of the victim Impression management Narrative-supported psychological state

Bandana filed a false missing person report claiming the victims had gone on a trip, while maintaining normal social activities to deflect suspicion and manage public perception.

Narrative-supported psychological state · High confidence

9 Investigation, confession, and evidence recovery Case-wide Explicitly reported

Police investigation uncovered financial irregularities and CCTV evidence, leading to Bandana's confession and recovery of bodies and murder weapon, confirming the sequence of events.

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 psychological assessments or clinical diagnoses. The narrative is based on reported events and alleged actions without access to personal statements from the suspect or victims. Some emotional states and motives are inferred from behavior and context rather than explicitly reported. The reliability of some accounts, such as the suspect's internal emotional experience or detailed interpersonal dynamics, cannot be fully verified. The timeline and details rely on investigative and media reports, which may omit nuanced psychological factors.

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