BAKERSFIELD, Calif. (KGET) — A 37-year-old Shafter man is accused of threatening to kill a co-worker then choking him unconscious, according to a court filing.

Clayton Dean Unruh pleaded not guilty Tuesday to charges of attempted murder, assault on a person with force likely to produce great bodily injury and making criminal threats. He remains in custody on $550,000 bail, according to sheriff’s inmate records.

The alleged assault happened the afternoon of June 10 while Unruh and the co-worker were in McKittrick. The co-worker was seated in a semi-truck when Unruh — listed at 6 feet, 260 pounds — opened the door.

According to a probable cause declaration, Unruh grabbed the co-worker by the throat and squeezed, telling him, “I’m going to kill you, I know where you live.”

“(The co-worker) sustained redness and marks on his neck as well as redness inside of his eyelids, consistent with being strangled,” an investigator wrote in the declaration.

Unruh was booked into jail June 14, according to inmate records. He’s due back in court June 28.