Matthew Nicholson, 28, of Ceres, Calif. was in his bedroom sometime before 9:45 p.m. Thursday playing video games when he got upset and started yelling, investigators said.
Officers found Nicholson's 68-year-old mother, Lydia Nicholson, inside with a head wound.
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He blamed his mother for this, police said, and threatened to kill her and his father, identified by Fox 40 as Loren Nicolson.
When the victim went to check on Nicholson, the pair began to argue. "He came out yelling something about, 'My headset is broken, '" police spokesman Greg Yotsuya told NBC affiliate KCRA. A long-time friend of the family elaborated, telling FOX40, "I understand that he would've killed the father too, but the gun jammed. The father grabbed the gun, emptied it".
KCRA 3 News reports Lydia was active in the community and volunteered in local schools.
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It ended with the death of his mother, Lydia, according to investigators. "Speechless", said Ron Kutzman, a neighbor of the Nicholson family.
Police pulled up to the house on River Valley Circle just before 10pm. She was taken to an area hospital for treatment but later succumbed to her injuries.
Officers tracked the vehicle to the relative's home and took Nicholson into custody.
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Police apprehended Nicholson in Riverbank without further incident and booked him into the Stanislaus County Jail where he is being held without bail. "Was it the video game or was there something else going on".