Retired police officer kills 3 in shooting at California biker bar targeting estranged wife

A retired police sergeant opened fire at Cook's Corner, a biker bar in California, killing 3 and injuring 6.
The gunman, John Snowling, targeted his estranged wife Marie during the shooting but she survived her injuries.
Snowling had traveled from Ohio due to an ongoing divorce dispute and confronted his wife without warning.
After shooting his wife, Snowling fired randomly at patrons before being killed in a shootout with deputies.
The motive is believed to be related to the divorce proceedings between Snowling and his estranged wife.