Las Vegas Metropolitan Police Department and Othram Partner to Identify 1989 Murderer of Stephanie Isaacson

Advanced DNA testing has revealed Darren Roy Marchand as the suspected perpetrator in the brutal murder of a 14-year-old Las Vegas teen

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Published July 21, 2021 by Michael Vogen
Media Inquiries


In June 1989, 14-year-old Stephanie Isaacson headed out on her morning walk to Eldorado High School. The Las Vegas teenager frequently took a shortcut through a vacant sandlot off Steward Avenue and Linn Lane to get to school quicker. After school let out that afternoon, Stephanie’s father began to worry when she did not arrive home at her usual time. Upon calling the school in hopes of finding out where she may be, it was revealed that Stephanie never made it to school. A missing person report was filed and law enforcement investigators then conducted a local search, canvassing the area around the typical route that Stephanie would take to school. Her body was found at a sandlot and investigators determined she had been sexually assaulted and strangled to death. Over the years, a lengthy investigation, spanning decades, ensued and all available investigative leads were exhausted. Stephanie's killer remained undiscovered.

In 2021, the Las Vegas Metropolitan Police Department teamed up with Othram to reexamine DNA evidence from the crime scene in hopes that advanced DNA testing might generate new leads in the investigation. Funding assistance was generously provided by Justin Woo, founder of the non-profit organization Vegas Helps.

Othram scientists used Forensic-Grade Genome Sequencing® to build a genealogical profile from the remaining DNA evidence — only 120 picograms (or 0.12 nanograms) of DNA. This sets a new lower limit on the quantity of DNA required to build a genealogical profile for a suspect of a crime. The Othram genealogy team used the profile to develop investigative leads that were returned to LVMPD. LVMPD detectives were able to confirm the identity of the suspect in Stephanie's sexual assault and murder as Darren Roy Marchand. The suspect died in 1995 by suicide but has been tied to other crimes.

Help fund another case Your contributions pay for lab supplies and research tools


Stephanie Isaacson's case featured on ISHI's Missing Piece Youtube series

February 22, 2022

Follow to watch how the case was solved through a combination of detective work, cutting-edge genomics, and philanthropy.

Michael Vogen

Michael Vogen

Director of Case Management

2829 Technology Forest Blvd Suite 100, The Woodlands, Texas 77381

Michael works with law enforcement agencies throughout the United States and Canada on “unsolvable“ cases that can benefit from advanced DNA testing methods. He helps these agencies use cutting edge DNA sequencing and new forensic techniques to develop investigative leads for their cases.

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About Othram Inc.

Othram is the world’s first private DNA laboratory built specifically to apply the power of modern parallel sequencing to forensic evidence. Othram’s scientists are experts at ... Read morerecovery, enrichment, and analysis of human DNA from trace quantities of degraded or contaminated materials. Founded in 2018, and located in The Woodlands, Texas, our team works with academic researchers, forensic scientists, medical examiners, and law enforcement agencies to achieve results when other approaches have failed. Follow Othram on Twitter @OthramTech or visit to learn how we can help you with your case. With anyone can make a difference and help solve the next cold case.