OKLAHOMA CITY - “My little boy saw Costello bloody over here.”
It was in a Braum's parking lot that a meeting between father and son came to a chilling and heartbreaking end.
“Earlier in the day, Costello agreed to meet at the restaurant. While at the restaurant, the incident turned violent and Christian Costello produced a knife and attacked Commissioner Costello,” said Capt. Paco Balderrama.
Those who witnessed the attack are still in shock.
“He was wobbling though the drive thru and you can tell they were coming from the back of the drive-thru.”
“The son was really calm. He actually put his blade up or hid it in his shirt when he went in. He was completely calm and that’s what was eerie about the whole thing."
Police say Christian stabbed his father several times, both inside and outside the restaurant.
“He stabbed him from standing position…Costello tried to block, but it landed in the neck-head region.”
That’s when witnesses stepped in.
Christian was completely calm... he didn't run, he didn't make any quick movements. He had a plan, and he was going to carry it out.
Christian’s family says he has a long history with mental illness. He's also had several run-ins with the law.
In 2012, he was charged with assault and battery against a police officer.
According to his attorney, his mental illness - and the fact that it was his first offense - played into why he didn't get jail time.
In 2011, Christian was charged with indecent exposure. A woman says he exposed himself outside of St. Eugene’s school in the Village. When police caught up to him -- they say Christian was chewing on bird feathers and eating dandelions.
There were also three calls concerning Christian Costello in Edmond -- all of them, said to be mental health related.