Alex Gallardo, Associated Press
Tim Liverman of Anaheim pays his respects at a makeshift memorial site where a homeless man Liverman knew was killed Friday night outside a fast-food restaurant in Anaheim, Calif., Saturday, Jan. 14, 2012. Police arrested a suspect in connection with the death. The death follows reports of the earlier stabbing deaths of three homeless men in north Orange County since Dec. 21. Police suspect all three were victims of a serial killer. It was not known if the latest death was connected to the other killings.

ANAHEIM, Calif. — Police in Southern California say they believe a man in their custody is responsible for all four recent killings of homeless men in Orange County.

Anaheim police said at a news conference Saturday that investigators have tied 23-year-old Itzcoatl Ocampo of Yorba Linda to the killings.

Ocampo was detained Friday night after a fourth homeless man was found slain in a Carl's Jr. restaurant parking lot.

Three other homeless men have been found stabbed to death in north Orange County since mid-December, and a task force of police officers, sheriff's deputies and FBI agents had been looking for the single suspect they believed was responsible for all three.

A phone number listed in Ocampo's name rang without an answer, and no one answered the door at two addresses listed in his name.