Domestic Shooting in CA - Federal ICE Agent Killed by His 14-Year-old Son

Local Fox News reports

A federal agent and Navy veteran was shot as he sat in his family room, killed by a bullet that came from outside through a window. Authorities say the bullet came from his own gun and it was fired by his 14-year-old son.
The boy called 911 to report the shooting of his father, Special Agent Myron Chisem, 42, a five-year veteran of U.S Immigration and Customs Enforcement, Los Angeles County sheriff's officials said Thursday. The son was later arrested and booked for investigation of murder. Neither the boy's name nor any possible motive was released.
"Evidence gained from the scene and statements made by the suspect" led to the arrest, sheriff's Lt. Holly Francisco said. The handgun used in the shooting belonged to Chisem and it was found in the front yard, she said.

Sad story. I wonder why they didn't call it an accident?