| Episode cast overview, first billed only: |
 | Jack Levin | - | Himself - Criminologist, Northeastern University (as Dr. Jack Levin) |
 | Nancy Bartley | - | Herself - Seattle Times |
 | Dave Reichert | - | Himself - King County Sheriff |
 | Neal Otey | - | Himself - Former Co-Worker |
 | Brenda Robinson | - | Herself - Former Neighbor |
 | Janine Mattoon | - | Herself - Former Neighbor |
 | Matt Haney | - | Himself - Green River Task Force |
 | Terry Rochelle | - | Herself - High School Friend |
 | Gino Durante | - | Himself - Former Neighbor |
 | Jeff Baird | - | Himself - Lead Prosecutor |
 | Mike Archbold | - | Himself - King County Journal |
 | Tomas Guillèn | - | Himself |
 | Jim Doyon | - | Himself - Green River Task Force |
 | George Johnston | - | Himself - Washington State Patrol Crime Lab |
 | Robert D. Keppel | - | Himself - Green River Task Force (as Dr. Bob Keppel) |