A California man fatally shot his wife, adult son and adult daughter on Thursday night before turning the gun on himself, police said Friday. Police received a call at about 9 p.m. (12 a.m. ET) and found four people suffering from gunshot wounds when they arrived at the scene in Modesto, California, according to a statement from the Modesto Police Department. Investigators determined that 57-year-old Stephen Mingham shot his 56-year-old wife, Janet Mingham; 33-year-old son, Chad Mingham and 34-year-old daughter, Nicole Mingham. He then shot and killed himself.

Three of the victims died at the scene, but one of the female victims, who was not identified, was brought to the hospital in critical condition, according to the Modesto Police Department. She later died of her injuries. Police said a motive has not yet been determined.

SOCIAL

Happening now...On scene of a shooting in the 2000 Blk of Sharilyn. Four shot, three deceased, including the suspect. pic.twitter.com/XVCwYmUyMC — Modesto Police Dept (@ModestoPolice) January 2, 2015

— Elisha Fieldstadt