Season 2

Theresa Wesolowski, 22, is found dead alongside her car near the Wisconsin factory where she worked on May 29, 1999. Police are baffled for nearly 10 years before finally getting a break when a new DNA technique identifies her killer.

Massachusetts waitress Sandy Berfield is killed instantly when she opens a package bomb left on her porch. Detectives uncover evidence of years of harassment and a rejected coworker's deadly plan for revenge.

Gayle Isleib is brutally gunned down in her driveway after coming from work at a local department store. Police uncover a twisted tale of infatuation, stalking, and a kidnapping plot gone awry.

In 1995, Robert Henry, an exec in Tacoma, WA, was murdered by a masked gunman. His wife tells police she thought he was killed by a former business associate. Det. Yerbury investigated and pieced together the evidence that convicted the killer.

Texas florist Leesa Nascimento is found floating in a lake with a gunshot wound to the head on July 6, 2010. Police uncover crucial evidence that suggests a recently fired employee may be responsible for the killing.

Alice Hufnagle is found raped and strangled in her Pennsylvania home on Nov. 22, 2002. After numerous leads and several dead-ends, police find the vital clues that lead them to question her coworker at a local pharmacy.