Court documents obtained by Action News revealed that Ramirez had a history of domestic violence. He was previously arrested in May 2020 for charges related to battery on a spouse or ex-spouse.
RELATED: Kern County Sheriff's deputy among 5 shot and killed during standoff in Wasco
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A Kern County Sheriff's Office Offense Report says a woman told deputies that Ramirez, her husband, pulled her hair and twisted her wrist.
The woman also told deputies that she was issued an emergency protective order a few weeks before and was in the process of filing a permanent restraining order against Ramirez.
He was booked into the Kern County Jail at that time.
Investigators said earlier this week that Sunday afternoon's standoff and shooting stemmed from a domestic violence incident.
RELATED: Hundreds gather to remember Wasco family, deputy killed in standoff
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The Kern County Sheriff's Office said they believe Ramirez killed his sons, who were 24 and 17 years old, and their 42-year-old mother. Ramirez had a previous restraining order against him that prohibited him from having firearms.
Officials say he was armed with an AK-47-style rifle and a handgun.
If you are the victim of domestic abuse, or you know someone who is, there is help available 24/7. In Fresno County, call the Marjaree Mason Center at (559) 233-4357. In all other locations, call the National Domestic Violence Hotline at (800) 799-7233.
Editor's Note: The video above is from previous coverage and will be updated.