OKLAHOMA (REUTERS) - The son of Oklahoma's Labor Commissioner was arrested after killing his father at a fast food restaurant in Oklahoma City on Sunday, CNN reported.

Mark Costello met his 26-year-old son Christian at a Braum's ice cream and fast-food restaurant at around 6:30 p.m. to reconcile with him following a fight.

Once inside, Christian attacked his father. The fight then continued outside the restaurant.

Witness Patrick Spencer was driving nearby when he said he saw a wounded man outside the restaurant and someone chasing him with a knife.

"We got a closer look and there was a guy chasing him with a knife," Spencer told KFOR. "It was shocking and dramatic."

The two men circled the building a few times before the son allegedly stabbed Costello in the head.

Costello also sustained stab wounds to his neck, but it is unclear whether those happened inside or outside the restaurant.

According to a witness, the Costello's wife tried unsuccessfully to get him into their vehicle in an effort to save him from their son.

The attack eventually came to an end when a witness in the parking lot used his vehicle to ram the assailant to the ground.

Christian Costello was arrested in the parking lot. His father succumbed to his wounds at an area hospital.

Authorities have yet to release details regarding possible motives behind the stabbing.

Mark Costello was first elected Labor Commissioner in 2010 and again in 2014. He was married and had five children.

Christian Costello had previously been charged with indecent exposure and pleaded guilty to charges of misdemeanor assault involving a police officer and driving under the influence of a drug, according to the Oklahoman.