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.

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.

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.

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.

When Alisha Bromfield's supervisor, Brian Cooper, promotes her to team leader she should be ecstatic. But Brian's motives are not entirely good. Alisha stands her ground with Brian, letting him know she doesn't want a relationship beyond co-workers.

Two school secretaries disappear in broad daylight, while on their lunch break; one of the school secretaries is found dead and the other is still missing. Police suspect that the perpetrator of the crime has ties to the school.

Bubbly 24-four-year-old grocery store worker Caroline Nosal befriends her introverted new colleague Christopher O'Kroley, but he soon begins harassing her. When she complains to management about him, he is dismissed from work and things don't turn out as planned.

One June morning in 2013 in Dundalk, MD, cleaning lady Myra goes to the property office of a townhouse complex and sees a nightmare scene. The office has been ransacked, blood is everywhere, and manager Melinda Schaefer is dead.

Mystery shrouds a San Diego exotic wildlife park when a valued employee, Denise Vasseur, goes missing. As the search to find her intensifies, investigators fear that the most dangerous predator at the park may not be an animal.

Scientist Kerri Harris and a colleague find a hidden camera in the ladies' room, and she makes a complaint. However, as police begin their investigation, Kerri is found stabbed to death in her office with co-workers just feet away.