CARSON, Calif. (AP) - A 14-year-old boy was arrested Thursday after shooting and killing his father, a federal agent, as he sat in the family room of their suburban home, authorities said.

The father was found dead after the boy called 911 late Wednesday and said the man had been shot in the back of the head by a bullet fired through a window from the backyard of their home in Caston, near Los Angeles, sheriff's officials said.

"Evidence gained from the scene and statements made by the suspect" led to the arrest, sheriff's Lt. Holly Francisco said.

The boy was taken into custody at the home and booked for investigation of murder.

No motive for the killing was released.

Authorities said the 42-year-old victim had worked as an agent with U.S. Immigration and Customs Enforcement for four years. Officials did not immediately release his name.

Shawn Butler, a friend, said Myron Chisem had moved into the home within the past year and he never saw any trouble between the father and son.

"I have no answer to why or how" the attack occurred, Butler said. "Everything was coming together. Everything was peachy, peachy, lovely."

The boy did fairly well in school and liked to play video games, Butler said.

"He was a happy kid," he said.

Butler said Chisem had two older daughters and worked at Los Angeles International Airport on contraband and smuggling investigations.

The shooting occurred in a two-story home about 20 miles south of downtown Los Angeles on a row of modest but tidy homes tucked in an industrial area.

A KTTV news helicopter showed ICE agents lining the driveway and saluting as the body, covered by an American flag, was wheeled to a coroner's van.

"This is a difficult time for ICE, especially for the family and loved ones of the agent. Please keep them in your thoughts and prayers,' ICE Director John Morton said in a statement.