ATOKA COUNTY, Okla. (KXII) -- A 20-year-old is now behind bars for the murder of his own father.
He first told authorities that a rifle fell and accidentally went off, but the sheriff said the evidence tells another story.
"There were just some issues in his story that didn't coincide with the way the evidence was laid out in the residence," Sheriff Tony Head said.
Atoka County Sheriff Tony Head said 20-year-old Wyatt Arp called them Thursday evening saying a rifle that was leaning up against the wall fell when he slammed the door. He told them the rifle discharged when it hit the floor, shooting and killing his father, 55-year-old Douglas Arp.
Wyatt was also already on probation for assaulting his father. Head called in OSBI to help investigate.
"The placement of where the bullet went just didn't fit how he alleged it happened to start with," Head said.
So Monday morning, Head and an OSBI agent tracked Wyatt to the Atoka County Medical Center. While the agent interviewed Wyatt about the shooting, he changed his story.
"He did grab a gun in the house, pointed it at his father and the gun discharged killing his dad," Head said.
Wyatt was taken into custody for first degree murder.
While the arrest affidavit and details are not available yet, Head said Wyatt did admit to having the gun in his hand when it discharged, but still claims it was an accident.
"Him and his dad did get into an altercation earlier that evening, but in the heat of the moment, I guess things transpired that caused him to do something irrational," Head said.
The case is still under investigation.