CREEK COUNTY, Oklahoma - The Creek County Sheriff and Oklahoma Bureau of Investigation said they want to speak to a man who may have "crucial information" in the case of a man found dead in a ditch Wednesday near Kellyville.

The sheriff's office and OSBI agents said they would like to speak with Robert Firethunder in the homicide investigation. 

The body of 18-year-old Nickolas Martinez was found September 20 in a rural area in Creek County. 

A homeowner called police at about 3:15 p.m. on September 20 after finding Martinez's body on their property off Highway 66. His body was found covered with a cloth. 

Investigators said they believe he was killed within the few days of his body being found. 

Investigators are also looking for a light-colored, four-door SUV that they said the victim was last seen in as a passenger.

The Creek County Sheriff urges anyone with information in the case, Firethunder’s whereabouts or for the SUV to contact them at 918-224-4964.