The bodies of two young women found dead in suitcases on the side of the road lead investigators to a former cop with a double life and a stunning confession.

A mother of three is stabbed nearly 200 times in front of her youngest children. Investigators reveal a sick and twisted motive behind the deadly rampage, and the daughter who witnessed the attack speaks out for the first time.

Newlywed Lauren Phelps is stabbed 123 times as she fights for her life, and her killer blames the deadly rampage on cold medicine.

Fifty-one-year-old mom Gretchen Anthony goes missing from her Florida home. Stunning surveillance video in and around the home reveals the twisted tale of her final hours.

A romantic early morning boat ride turns deadly when Larry Isenberg falls overboard. Soon after, investigators uncover the disappearance of $500,000, which could be motive for murder.

Twenty-four-year-old Alex Woodworth is brutally stabbed 16 times and left for dead hanging halfway out of the killer's car. As investigators peel back the layers, they reveal the killer's many lovers may be motive for murder.