ENID, Oklahoma - Two people believed to be responsible for the deaths of a Sapulpa police officer and his cousin are now in custody.

Jonathan Grafton, 22, and his girlfriend Daphne Mason, 21, were taken into custody in Enid Monday morning. Enid Police arrested them after they were spotted sleeping outside a convenience store, according to Midwest City Police Chief Brandon Clabes.

Clabes said they are going to Enid to pick the pair up.

''It's a sad case, but I'm glad we got them in custody. We're glad nobody else was hurt, too," Clabes said.

Midwest City police say Lieutenant Trey Pritchard and his cousin Jeffrey Grafton were murdered Saturday night in Midwest City. The two men had gone to the Traveler's Inn in at 6821 South 29th Street because Jonathan Grafton had stolen his father's truck, authorities say. The cousins, both 46, tracked the stolen Dodge pickup using its GPS.

Pritchard and the elder Grafton were found dead in the motel room, rented earlier in the day by Jonathan Grafton. The two men had been shot in the head, according to an arrest warrant.

Investigators believe Jeffrey Grafton went inside the motel room first to confront his son. When he didn't return, police believe Pritchard went inside the room and also was killed, Midwest City Police Chief Brandon Clabes said Sunday.

According to court documents, officers spoke with a house keeper at the motel who said at about 1 p.m. Friday, she heard some screaming coming from the room where the victims were found. She said a short time later, she saw a man and a woman come out of the room and leave in a brown Dodge pickup truck. 

Officers said they searched the motel room where the victims were found, and located Mason’s medications and clothing. Jeffrey Grafton’s pickup truck was later located in the 3600 block of Janus Circle, but no one was inside.

“We want to thank all the law enforcement agencies involved in this manhunt, especially the United States Marshall Service and Enid Police Department.  There was an heighten concerned that both murder suspects would be violent when faced with arrest—fortunately no one was injured and we are closer to bringing this tragic case to a conclusion,” Chief Brandon Clabes said.