OKLAHOMA CITY - The search for an Oklahoma man wanted in a string of killings, shootings and carjackings is entering its fourth day, and authorities say they have no idea where he is.

Michael Dale Vance Jr. is wanted on multiple charges, including two counts of first-degree murder for the near-decapitations of two relatives in the town of Luther that Oklahoma County Sheriff John Whetsel described as "rage killings."

The 38-year-old Vance was last seen early Monday about 30 miles from the Texas border in western Oklahoma. Whetsel says Vance could be anywhere from California to Florida.

Whetsel says it's also possible that Vance has died if he hasn't received medical treatment for a gunshot wound he suffered Sunday during a shootout with police in Wellston, 35 miles northeast of Oklahoma City.