Oklahoma City — Oklahoma Labor Commissioner Mark Costello died Sunday after a stabbing at an Oklahoma City restaurant, authorities said.

Officers were called to a fast-food restaurant on the city’s northwest side after a stabbing was reported, Oklahoma City Police Lt. Michelle Holland said. The altercation started inside the building and spilled into the parking lot, she said.

Police would not immediately release the identity of the man who was killed, but State Medical Examiner’s Office spokeswoman Amy Elliott confirmed Costello was the victim of the attack.

A spokeswoman for the Labor Department also confirmed Costello’s death.

Bystanders outside the restaurant helped subdue a male suspect until officers arrived and took the suspect into custody, Holland said. The attacker knew the victim, Holland said, although she did not know the extent of their relationship.

A successful businessman from Bartlesville who founded a telephone software company in 1984, Costello ousted the incumbent Democrat with 64 percent of the vote during a Republican sweep of statewide offices in 2010. He easily won re-election in 2014.

“I’m just numb right now, as many of us are,” Oklahoma Republican Party Chairman Randy Brogdon said. “He was a great Christian, a good man and a wonderful husband and dad. He is going to be sorely missed.”

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