OKLAHOMA CITY — Prosecutors filed a first-degree murder charge Monday against a man accused of fatally stabbing his father, Oklahoma Labor Commissioner Mark Costello, during an attack at a fast-food restaurant.
Police have said Christian Costello, 26, pulled out a knife while he and his 59-year-old father talked Aug. 23 at a Braum's restaurant and ice cream shop on Oklahoma City's northwest side. Witnesses said the attack continued after Mark Costello ran into the parking lot where his wife, Cathy Costello, tried to intervene and stop the assault.
"Homicide detectives were summoned to the scene, and interviewed at least 17 witnesses, all of whom stated they observed the defendant stabbing the victim with a small knife," police inspector Lyndell Easley wrote in an affidavit attached to the charge.
The state medical examiner's office last week ruled Mark Costello died from stab wounds to the neck and classified the death as a homicide.
Christian Costello is being held without bond in the Oklahoma County jail, and court records do not indicate if he has been assigned an attorney.
Court records show Christian Costello once spent 90 days in a mental health facility and took mood stabilizers. His family said in a statement that he suffers from a mental illness, although they did not specify which one.