Officers responded to the scene a little before 10 p.m.to investigate, and found a 68-year-old woman who had been shot in the head.
Matthew Nicholson, 28, was playing video games in the bedroom of his Ceres, Calif., home on Wednesday night when an argument broke out with his mother Lydia Nicholson.
Nicholson drove off but was stopped in the town of Riverbank.
Nicholson's 68-year-old mother went to check on him, and he started arguing with her.More news: Nintendo got to show off Dark Souls: Remastered first for a reason
Sgt. Greg Yotsuya of the Ceres Police Dept. said, "He came out yelling something about "my headset is broken" or something about the headset being broken, and then grabbed a gun and started shooting".
After threatening to kill both his mother and father, police say Nicholson retrieved a handgun and used it to shoot two rounds into the wall, then shot his mother in the head.
His father, Loren Nicholson, 81, wrestled the gun out of his hands.
"[She] had so much compassion for people and just wanted to see the best in people at all times", said Autumn Nicholson of her mother. A long-time friend of the family elaborated, telling FOX40, "I understand that he would've killed the father too, but the gun jammed".More news: Catholic school founder among mudslides' fatalities in California
Matthew Nicholson had only driven a couple of miles away, and police pulled him over near a relative's home in Riverbank.
Autumn White (foreground) with husband Chris White and her parents in the background during a Christmas church service..
Matthew Nicholson stayed with his parents in a powder blue house with a basketball hoop over the garage door.More news: Pak Army must feel pain for support to terror: Army Chief
Lydia Nicholson was taken to the hospital where she died.