A Systematic, Scientific, Multidisciplinary, Decedent-Centered Approach to Death Investigation
Laura Pettler & Associates (LPA) conducts death investigations and formal case reviews using Dr. Laura Pettler’s Murder Room (TMR) Death Investigation Method—a 360-degree, systematic, scientific, multidisciplinary, interdisciplinary, decedent-centered investigative framework designed to support accurate, defensible, and prosecutable outcomes.
Proper method selection is foundational to reliable death investigation. Investigative outcomes are shaped not only by the evidence available, but by how that evidence is organized, evaluated, and synthesized, as well as by the education, training, experience, and research grounding of the investigator or reviewer applying the method.
Why Methodology Determines Investigative Reliability
Death investigations are typically conducted in one of three ways:
Using a methodologically appropriate system
Using an inappropriate or misapplied system
Proceeding without any systematic methodology
Investigators who employ a methodologically appropriate system are significantly more likely to reach accurate, complete, and defensible conclusions than those relying on incorrect or non-systematic approaches—regardless of individual experience or tenure.
The absence of a systematic method precludes true investigation. Investigation, by definition, requires a formal, structured inquiry designed to discover, examine, and evaluate facts in order to establish truth. Methodless analysis substitutes opinion for inquiry and speculation for evidence.
Risks of Incorrect or Methodless Death Investigation
Improper system selection—or the absence of a system altogether—frequently results in:
Incomplete or fragmented analysis
Erroneous or unsupported conclusions
Undetermined manners of death
Non-prosecutable or trial-vulnerable cases
Unresolved or misdirected investigations
Of these, the methodless approach poses the greatest risk, as it replaces structured inquiry with subjective interpretation.
Opinions rendered without systematic research and disciplined analysis fail to meet evidentiary thresholds for probable cause, prosecutorial review, or admissibility under applicable rules of evidence, including standards of reliability, authenticity, completeness, and credibility. Disordered data analyzed without method yields inconsistent, disputable interpretations and increases susceptibility to bias, tunnel vision, speculation, and ethical compromise.
Accordingly, LPA adheres to empirically grounded principles of validity, reliability, objectivity, and ethical practice, while maintaining respect for decedent dignity, subject neutrality, and the integrity of the criminal justice process.
Philosophical and Scientific Foundations of LPA Case Review
LPA death investigations and case reviews are interpretive in nature and grounded in Hegelian dialectic philosophy, wherein competing explanations are examined through structured contradiction and reconciled through disciplined synthesis toward a higher level of truth. This approach allows contradictory evidence to be evaluated without premature resolution or investigator bias.
Within this framework, scientific investigation is defined as the systematic development and execution of a structured, multistage plan for quantitative and qualitative data collection, followed by rigorous analysis and synthesis to answer defined investigative questions.
Multidisciplinary, Interdisciplinary, and Decedent-Centered Analysis
A multidisciplinary approach integrates forensic science, medical science, behavioral science, and social science perspectives to evaluate physical, biological, medical, behavioral, and sociological evidence.
An interdisciplinary approach coordinates and integrates expert findings across disciplines rather than treating them in isolation.
A decedent-centered approach prioritizes analytical study of the decedent as an individual—examining victimology, relationships, behavioral patterns, and case dynamics in direct relation to the evidence and investigative questions.
Definition: Decedent-Centered Case Review
For purposes of LPA reporting, a systematic, scientific, multidisciplinary, interdisciplinary, decedent-centered case review is defined as:
An organized analytical system designed to identify, collect, analyze, synthesize, and evaluate quantitative and qualitative evidence in order to assess interrelationships among cause of death, manner of death, victimology, scene dynamics, behavioral patterns, and offender characteristics, as substantiated by testimonial, physical, behavioral, and sociological evidence.
Origins: Victim-Centered Death Investigation Methodology (VCDIM)
In 2014, Dr. Laura Pettler developed Victim-Centered Death Investigation Methodology (VCDIM), based on Benjamin Bloom’s Taxonomy of Cognitive Domains. Applied to death investigation, this framework organizes investigative practice into a hierarchical progression—from knowledge acquisition through evaluation—ensuring disciplined movement from data collection to defensible conclusions.
VCDIM provided a structured conceptual model for achieving investigative objectives through systematic data generation, collection, analysis, and synthesis, evaluating both individual evidence items and the totality of the case in relation to the decedent, subject, and their relationship.
The Murder Room (TMR) Death Investigation Method
In 2017, VCDIM evolved into The Murder Room (TMR), LPA’s proprietary death investigation and case review system.
TMR is designed to support scientific inquiry through controlled, sequential progression across six stages, incorporating built-in safeguards to prevent:
Premature conclusions
Analytical shortcuts
Confirmation bias and tunnel vision
Each stage contains rank-ordered micro-methods that must be completed sequentially before progression. This structure preserves methodological integrity from initial knowledge acquisition through final evaluation.
TMR is adaptable to case-specific circumstances while maintaining internal validity and reliability. Specialized adaptations exist for both active (“hot”) cases and historical (“cold”) cases.
While case clearance and charging decisions rest with jurisdictional authorities, TMR functions as a comprehensive framework for evaluating manner of death, staging indicators, event dynamics, and offender characteristics.
Prosecutorial Utility and Role Clarification
The Murder Room (TMR) is designed to support accurate, prosecutable case development and to safeguard the integrity of charging decisions.
LPA’s primary role is to organize complex death investigations by identifying, validating, and narrowing the evidentiary record to critical, trial-relevant evidence, while sequestering non-probative, duplicative, or misleading material.
In addition to strengthening viable prosecutions, the TMR process is used to assess whether existing evidence supports the charged theory and charged individual, or whether inconsistencies, gaps, or misaligned evidence warrant re-examination. This function assists prosecuting authorities in avoiding mischarging, tunnel vision, and evidentiary vulnerabilities that could compromise a case at trial.
In many matters, this work clarifies investigative direction, supports charging or declination decisions, and strengthens trial preparation to such an extent that independent expert testimony by LPA personnel is not required. Evidence refined through the TMR process is typically presented through appropriate law enforcement witnesses and subject-matter experts designated by the prosecuting authority.
When requested, LPA provides litigation support and expert testimony consistent with the scope of retention and applicable evidentiary standards. Final charging decisions, case clearance, and trial presentation remain the responsibility of the investigating agency and the district attorney’s office.
