The 43-year-old gunman named locally as Kevin Neal went on a shooting spree and killed four people in the Northern California on November 15.
Later, the police killed him after confronting him in a stolen vehicle. The police recovered a semi-automatic rifle and two handguns from one of the crime scenes.
He chose most of the victims at random, said the police.
According to the reports, he entered into the grounds of an elementary school and shot into the school. He could not enter the classrooms as the teachers’ had locked the doors, due to which he reportedly became frustrated and left after six minutes.
The mass shooting, which began around 8:00 am (1600 GMT) at a home in Rancho Tehama Reserve continued at several locations in the community, including the elementary school, said Tehama County Assistant Sheriff Phil Johnston.
According to him, no children were killed and the motive for the assault was still unclear, though domestic dispute and a history of disagreements with neighbours can be the reason.