Grandfather Jack Rains, 83, is murdered in his home in Murfreesboro, Tenn.; when rumors emerge of an affair between the victim and a women half his age, police start to investigate his close friends.

Elderly couple Roy and Angie Woodley are found stabbed to death in their Fresno, Calif., home.

While searching for Tami Reay, detectives find blood in her car and arrest her husband, Brad; then, they receive a tip pointing at an entirely different suspect.

After Joe Morrissey is brutally killed in an apparent home invasion, detectives come to believe that the attack was personal and focus on Joe's wife, Kay.

Melissa Atkin is found bound and murdered in her home in Smyrna, Tenn.

After John Riebe is found murdered, calls and voice mails prove key in the investigation.