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CARSON, Calif. -- A friend says he never saw any problems that might have led a 14-year-old boy to shoot his father, a federal agent, at their Southern California home.

The boy was arrested on suspicion of murder Thursday morning at his Carson home in south Los Angeles County. Authorities say he called 911 Wednesday night and reported that his father had been shot in the head by a bullet fired through the window from the backyard.

A friend, Shawn Butler, identifies the victim as U.S. Immigration and Customs Enforcement agent Myron Chisem. He was about 40.

Authorities haven't released the agent's identity.

Butler says Chisem's son moved into the home within the past year. He says he never saw any trouble between the two.

No motive for the killing has been released.

By GREG RISLING Associated Press