Unsolved Mysteries: Cindy Song’s Haunting Halloween Disappearance

On the evening of October 31, 2001, Cindy Song, a 21-year-old Penn State student, dressed up in a Playboy bunny costume and headed out with friends to celebrate Halloween.

After a night of partying, dancing, and a stop at a 24-hour diner, Cindy was dropped off at her apartment on West Clinton Avenue around 4 a.m. It was the last time anyone would see her alive.

When police entered her apartment two days later, the door was locked. Her backpack was by the door. Her cell phone and false eyelashes were left behind on the bathroom counter...