SAN FRANCISCO -- Three young transients charged in the shooting deaths of a Canadian backpacker and a yoga instructor in California have been booked into a jail and face arraignment later this week.

   The three arrived in California and were taken to Marin County jail on Monday evening, the county sheriff's office said. They were arrested last week in Oregon.

   The body of Audrey Carey, 23, was discovered in Golden Gate Park the morning of Oct. 3. She was shot once in the head, police said.

   Investigators believe Carey was camping in the park, which was hosting a free, three-day bluegrass festival. She had left her home in Quebec to go backpacking in the U.S. and Europe.

   Tantric yoga instructor Steve Carter, 67, was found dead two days later along a popular hiking trail, 20 miles (30 kilometres) north of San Francisco. He was still clutching the leash of his dog, the Marin County Sheriff's Office said. The dog also was shot but is expected to survive. Carter had been living with friends while caring for his wife, who has cancer.

   An arraignment hearing for 24-year-old Sean Michael Angold, 23-year-old Morrison Haze Lampley and 18-year-old Lila Scott Alligood has been set for Wednesday, authorities said. It's unclear if they have retained lawyers.

   Marin County District Attorney Ed Berberian said each suspect is charged with two counts of murder with special circumstances, including lying in wait -- charges that could lead to the death penalty.

   San Francisco Police Commander Toney Chaplin said the same gun was used in both killings.

   Authorities found the weapon when they arrested the suspects Wednesday outside a Portland, Oregon, soup kitchen, he said. The three also were found in possession of Carter's car and some of Carey's camping gear.

   Chaplin said the gun was reported stolen from an unlocked car parked in San Francisco's Fisherman's Wharf neighbourhood.

   The Marin County district attorney added a special circumstance of multiple killings to each of the transient's murder charges, enabling him to prosecute both shooting deaths in one trial.