King, who was from the Toronto area, disappeared Feb. 29 after posing for Fredericks in a hard-core bondage shoot that had been arranged over the Internet, authorities said. Her body was found nearly a month later, naked and slashed and still wearing bondage devices.

Castor said police found a note in a camera bag in Frederick's home that served as a contract between a photographer and an actor. It listed various types of video and photo shoots and used the phrase "snuff vid."

Detectives obtained several bloodstained items from Frederick's car and from his apartment in the Philadelphia suburb of Conshohocken, and the DNA matched that of Frederick and King, authorities said.