Gwinnett County police are investigating why a woman shot her husband to death, then fatally turned the gun on herself Saturday night.

Hyun "Mickey" Yu, 35, shot Shan Chun Yu, 46, once in the head while he was seated at his computer at their home in the 6300 block of Zachary Drive, near Norcross, police spokesman Cpl. Edwin Ritter said Monday.

Police received a 911 call about the shooting around 9 p.m. from a family member -- a 20-year-old female who police say may have been the couple's daughter. When police arrived, they found the husband,  Shan Yu, dead. Hyun Yu was pronounced dead on arrival at Gwinnett Medical Center, police said.

Police say they are attempting to establish a motive for the shooting.

Check back for details.