Detained man suspect in 4 Calif. homeless killings (AP) - Investigators are "extremely confident" that a man in their custody is responsible for all four recent killings of homeless men in Orange County, Anaheim Police Chief John Welter said Saturday. Welter said at a news conference that investigators have tied 23-year-old Itzcoatl Ocampo of Yorba Linda to the killings, which have struck fear into the area's homeless community for the past month. Ocampo was detained Friday night after a fourth homeless man was found slain in the parking lot of a fast-food restaurant. 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. "We are extremely confident that we have the man that is responsible for the murders of all four homeless men in Orange County," Welter said. Ocampo could not immediately be reached for comment. A phone number listed in his name rang without an answer, and no one answered the door at two addresses listed in his name. Earlier Saturday, mourners wept and placed flowers at the scene of death of the latest stabbing victim, who was described by friends as a Vietnam War veteran in his 60s named John. He was found between 8 p.m. and 9 p.m. Friday in a Carl's Jr. parking lot at the intersection of La Palma Avenue and Imperial Highway in Anaheim, police said. I told him after pay day I was going to get him a cellphone, so he could call 911 if anything happened. Holland was paid Friday but didn't get the chance to get the phone to her friend. I ran over and hugged my friend, screaming, `Please tell me it's not John!' Police set up a large containment area at the crime scene in a search for the killer and scoured nearby neighborhoods, including a mobile home park, Dunn said. A police bloodhound traced the scent from Ocampo's belongings back to the scene where the attack occurred, about 10 miles northeast of the Disneyland Resort, authorities said. Ocampo was being held without bail on suspicion of murder, Dunn said. A task force of law enforcement officers from Anaheim, Placentia, Brea, the Orange County Sheriff's Department and the FBI had been formed to investigate the killings of the three other homeless men.