Sequoyah County Cold Case Suspect Says He Didn't Act Alone, Documents Show

A man investigators arrested almost 16 years after the crime told deputies two other people were involved in the killing of a Sequoyah County man, according to a probable cause affidavit.

Mitchell Nixon died of "blunt trauma" to the head, according to the affidavit.

Sequoyah County deputies arrested Rex Robbins, 38, Wednesday on suspicion of first degree murder.

According to the affidavit, Robbins told investigators a friend picked him up in October 1997, and that he and the friend did drugs together. The suspect told authorities they went to a tower on Tower Estates Road and that two other people showed up, one of them being Nixon.

3/6/2013 Related Story: Sequoyah County Sheriff Makes Arrest In 1997 Cold Case Murder

According to the court document, Robbins claims one of the other men hit Nixon with a rock. Robbins admitted to hitting Nixon as well, according to the affidavit.

Robbins told investigators one of the other people involved wanted to "bully" Nixon and get his truck. Robbins says Nixon told them to stop as they allegedly hit him, according to the court document.

The suspect told authorities one of the other people took the rear view mirror from Nixon's truck and used it to do drugs. The affidavit says Robbins claims he washed the outside of Nixon's truck and changed his bloody clothes.

Robbins told investigators he took the truck to the Walmart parking lot in Sallisaw and left it with the keys in it, according to a court document.

Sequoyah County Sheriff Ron Lockhart told CBS affiliate KFSM in Fort Smith, Arkansas that his department plans to make more arrests. Robbins is being held without bond in Sequoyah County.