RELATED: What we know about Half Moon Bay mass shooting suspect Chunli Zhao
In 2013, Chunli Zhao had a restraining order filed against him by a former roommate and coworker. They both worked at a restaurant when Zhao reportedly lost his job, the documents say.
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According to the documents, the roommate says Zhao threatened that if he didn't get his job back, he would kill him. Zhao, at one point, even held a pillow over his face, reportedly trying to suffocate him.
The documents also note he said, "he wants to come back to work. If this can't be done, this will be a bigger problem which will not be good, pleasant for anyone."
EXCLUSIVE: Video shows police takedown of Half Moon Bay shootings suspect
EXCLUSIVE: Video shows police takedown of Half Moon Bay shootings suspect
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The roommate said he threatened to use a knife to cut his head if he couldn't come back to work and had no other choice.
The sheriff's office was unable to serve Zhao with the court papers - he never showed up to hearings.
The restraining order was granted by a judge and extended a second time.
Get the latest on the deadly Half Moon Bay shootings here.