A massive, week-long manhunt for a suspect in a string of violent crimes, including the killing of two relatives, the shooting of two police officers and multiple carjackings, ended on Sunday evening in a police chase and shootout.
Authorities said Michael Dale Vance Jr, 38, was shot dead by an Oklahoma state trooper near Leedey, about 130 miles (209km) north-west of Oklahoma City.
Earlier in the day, Vance shot and wounded a Dewey County officer and fled in a car, according to Dave Turk, spokesman for the US Marshals Service in Washington DC, which took part in the manhunt.
Officers pursued Vance for about half an hour when he was approached by an Oklahoma state trooper.
"There was an exchange of gunfire between the state trooper and the subject, and the subject was killed," Mr Turk said.
Vance was wanted on multiple charges, including two counts of first-degree murder.
The manhunt began after he shot and wounded two police officers in Wellston, 35 miles (56km) north-east of Oklahoma City, on October 23, authorities said.
Vance was suspected of shooting a woman and stealing her vehicle at a mobile home park near Wellston, then driving about 8 miles (13km) to his relatives' mobile home in Luther and killing them.
Ronald Everett Wilkson, 55, had been shot and had stab wounds to his neck "consistent with an attempt to sever his head", an arrest affidavit said.
Valerie Kay Wilkson, 54, had similar neck wounds along with defensive wounds on her arms, the affidavit stated.
Authorities also believe Vance filmed two Facebook Live videos documenting his run from police before going to the Wilksons' mobile home.