The Latest on Oklahoma stabbing: Police say motive unknown

Oklahoma Politician Stabbed To Death, Son Being Held

OKLAHOMA CITY (AP) — The latest on the fatal stabbing of Oklahoma's labor commissioner (all times local):

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9:55 a.m.

Police say the 26-year-old man accused of fatally stabbing his father, an Oklahoma politician, brought a knife to the restaurant where they'd arranged to meet.

Oklahoma City Capt. Paco Balderrama said Monday that investigators don't know yet why Christian Costello stabbed his father, Labor Commissioner Mark Costello, at the restaurant Sunday evening.

See photos of Mark Costello and the crime scene:

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Oklahoma politician Mark Costello stabbed
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The Latest on Oklahoma stabbing: Police say motive unknown
JUST IN: Sen. @jameslankford responds to the stabbing death of #OK Labor Commissioner Mark Costello. @NEWS9 http://t.co/P4LGWV5naL
Mark Costello was one of the most honest and decent political leaders I've ever dealt with. I am so saddened by his death
My family is stunned & deeply grieved to hear of the tragic death of Labor Commissioner Mark Costello. What a tragedy.
Folks, don't wait for the Governor's order. Please lower your Oklahoma flags to half-staff now, in honor of Commissioner Mark Costello.
Unbelievable news about Labor Commissioner Mark Costello. Condolences to his family on this unbelievable and unexpected loss.
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Balderrama says police interviewed 17 witnesses, including the victim's wife and suspect's mother, Cathy Costello, who was in a vehicle outside the restaurant.

He says he thinks Cathy Costello tried to stop her son from attacking her husband.

SEE ALSO: Police: Son arrested after Oklahoma official fatally stabbed

9:20 a.m.

Police records show that a man detained after the stabbing death of his father, Oklahoma's labor commissioner, was once held for three months for treatment of mental illness.

Records obtained by The Associated Press on Monday show that Christian Costello received a deferred sentence for driving under the influence of drugs in 2012. In his plea agreement, he disclosed the mental treatment and said he was taking mood stabilizers.

Costello is being held on a first-degree murder complaint after the stabbing death of his father, Oklahoma Labor Commissioner Mark Costello, on Sunday.

Last October, the younger Costello was accused of outraging public decency. Police say he exposed himself at a Catholic elementary school.

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