3rd Teen-Ager Held in Attack on Tourists : Crime: Alleged triggerman in the fatal shooting near Idyllwild is arrested in Salt Lake City. All three suspects are from Banning.

A third teen-ager was arrested Sunday in the slaying of a German tourist and the wounding of her husband earlier this month on a mountain highway near the Riverside County community of Idyllwild, authorities said.

The suspect, a 17-year-old whose name was not released because of his age, is believed to have been the triggerman in the May 16 robbery and shooting, said Riverside County Sheriff Cois Byrd. He was arrested early Sunday in a suburb of Salt Lake City.

Byrd said he is hoping the teen-ager will be prosecuted as an adult. He lives in the same area of Banning as two suspects who were arrested Wednesday.

Xou Yang and Khamchan (Brett) Ketsouvannasane, both 19, of Banning were booked Wednesday in connection with the shooting. Authorities described the teen-agers as associates of an Asian street gang, but investigators said gang activity was not believed to have played a role in the attack.

All three suspects were born in Laos and are legal U.S. residents, deputies said.

The handgun believed to have been used in the shooting and the suspected getaway car were seized by detectives who searched four homes in the Banning area last week.

The robbery and shooting left Gisela Pfleger, 62, dead from gunshot wounds to her head. Her husband, Klaus, 64, was critically wounded by gunshots to his face and shoulder. His wife died at the scene, but he struggled to his car and drove a half-mile to a parking lot, where a passerby summoned help.

Pfleger was listed in fair condition Sunday at Desert Hospital in Palm Springs, a nursing supervisor said.

The couple, from Emmerich in western Germany, were shot three days after arriving in Southern California to sightsee and visit their daughter in Redondo Beach. They were attacked at a scenic lookout point along California 243, overlooking Hemet in the San Jacinto Mountains.

They had driven an unmarked rental car up the winding, two-lane mountain highway from Banning. They stopped about eight miles from Idyllwild to see the view at the Indian Vista viewpoint. Authorities said they did not believe the pair were singled out because they were tourists, but were the victims of random violence.