EUREKA, Calif. (AP) _ A trucker walked into the sheriff's department, pulled a severed breast from his pocket and admitted his role in the slayings of four women, authorities said.

KNBC-TV in Los Angeles reported late Thursday that Wayne Adam Ford could be linked to as many as six slayings throughout California.

Ford, 36, of Arcata, was being held on murder charges in the Humboldt County Jail on $1 million bail. An arraignment scheduled for Thursday was postponed until Friday so investigators from all over the state could interview him.

Sheriff Dennis Lewis said Ford walked into his department on Tuesday, said he had some evidence, and pulled a Ziploc bag out of his pocket with a breast inside.

``He was remorseful and apparently had reached a point in his life where he wanted to talk about what he'd been involved in,'' Lewis told KINS-AM in Eureka.

Investigators in Eureka, 280 miles north of San Francisco, said the four victims they knew about were female hitchhikers who had been sexually assaulted before they were slain.

One of the slayings dates to 1997, when the torso of a woman 18 to 25 was found floating in a channel near Eureka, investigators said.

Investigators found six or seven body parts of the unidentified woman based on information Ford provided, said Sheriff Dennis Lewis. It wasn't immediately known where those body parts were found.

The breast was from another victim, who was killed recently and was a stranger to Ford, Lewis said. Ford walked into the sheriff's office, said he had some evidence, and pulled a Ziplock bag out of his pocket with the breast inside, Lewis said.

Authorities said Ford implicated himself in two other recent slayings, in San Bernadino and San Joaquin counties.

Ford admitted his role in the slaying of Patricia Anne Tamez, 29, of Victorville, whose body was found Oct. 23 in an aqueduct in Hesperia, according to a news release from the San Bernadino County sheriff's department. The cause of death was withheld.

Ford also allegedly told San Joaquin County investigators that he picked up a woman in Ontario, in Southern California, and dumped her body off Interstate 5 near Lodi, 30 miles south of Sacramento. San Joaquin County sheriff's spokesman Mike Padilla identified the victim as 25-year-old Lanett White of Fontana, whose body was found Sept. 25.