The Licked Envelope: DNA Traps a Cold Case Killer

This episode details the successful resolution of a 1982 cold case involving the murder of a young girl named Kristen Sumstad in Seattle. Although police initially questioned John Athen, the investigation stalled for two decades until advancements in DNA technology allowed detectives to revisit the evidence. To link the suspect to the crime, investigators executed a creative ruse by mailing Athen a fake legal settlement offer that required him to lick and mail back an envelope. The saliva recovered from the seal provided a perfect genetic match to the biological evidence found at the original crime scene. Consequently, Athen was arrested and convicted of second-degree murder, proving the effectiveness of forensic persistence and strategic deception in modern policing. The source highlights how reopening unsolved files can finally bring justice to families after decades of uncertainty. Content Warning: This podcast contains discussions of homicide, violence, abuse, and other graphic themes related to real-life criminal events. It is intended for mature audiences and listener discretion is advised. This episode includes AI-generated content.