Unusual Suspects - Season 3

In the dark of night, a Pennsylvania family is brutally murdered in their home. Only their 20 year-old daughter survives. Investigators wonder, who would kill this seemingly perfect family? The answer shocks their community for years to come.

In 1994, 20 year-old Missy Grubaugh is killed in her apartment. Police focus on a list of suspects -- a thieving former roommate, a threatening coworker, a sex offender boyfriend. In the end, a late-night call to the victim brings the case to a close.

In 1985, the homicide of three Arlington, TX, teens shocks the community. Investigators focus on an ex-boyfriend, teen Satanists and a drug addict with a grudge, but a shaky alibi and forensic evidence lead to a killer with close ties to the victims.

In 2002, a Brunswick, NY, couple are found murdered in their apartment. Girlfriend Arica is an innocent bystander, but boyfriend Sam is a drug dealer with dangerous enemies. In the end, a bloody print at the scene leads to a killer who defies belief.

In 1990, the murders of six women put San Diego investigators on the trail of a vicious serial killer. As all suspects come up clear, reports of a man loitering outside a health club bring the case to a shocking conclusion.

In 1997, Sarasota, Florida, couple Henry Caneva and Janet Scott are attacked in their home. Henry doesn't survive. Investigators work down a list of suspects, but it will take an unrelated domestic disturbance call to bring the case to a close.

A day after Katrina hits the Gulf Coast, a Lafayette, LA, man is shot by masked burglars. Police work through a list of suspects, to no avail. Three years later, crime scene evidence leads investigators to the opportunistic culprits.

Summer of 1992, 18 year-old Angel Ormston leaves to run errands, but never comes home. Did she run away, or was she made to disappear? Five months later, a gruesome discovery brings the case to a twisted and tragic conclusion.

Between 1993 and 1997, three women are murdered in three Des Moines, Iowa, hotels. Hampered by the sheer volume of suspects and the infancy of forensic testing, it takes years of dogged investigation to bring a sadistic killer to justice.

When a hardworking waitress ingests a lethal dose of poison, a nationwide panic ensues. Everyone is a suspect, until one of the most bizarre sting operations in Florida history leads detectives to the implausible poisoner.

When a Kentucky woman is murdered in her home, detectives theorize the gun advocate knew her attacker. Investigators scrutinize family, friends and boyfriends old and new before a shaky alibi and forensic evidence point to the killer.

A Maine father of four is found shot to death after going out for a beer. Is he the victim of a family squabble? Did he run afoul of local crooks? Years later, an unrelated cold case and a guilty conscience help bring the killer to justice.

In 1996, two women are murdered in the same Texas apartment complex. Authorities follow every lead, but the case goes cold. Three years later, DNA evidence and a seemingly unrelated crime lead authorities to the sadistic "Bathtub Killer."