Investigators say Helmlinger, 24, was shot to death and buried in a shallow grave in a trailer park. Relatives reported him missing on Oct. 4, a week after he stopped going to work at Tyson Foods in Green Forest. Police found his body on Oct. 18 when someone reported a mysterious mound of dirt and a shovel nearby.

Berryville police say Davis, 34, worked with Helmlinger at Tyson Foods and the pair spent a lot of time together. Police say Davis went by the name of Charles Hedstrom.

The night that Helmlinger’s body was found, Hedstrom and his family packed up and left town, police say. Witnesses told police that they’d seen Hedstrom near the shallow grave. That report led police to discover that Hedstrom was really Davis and was wanted in Savannah, Mo., on a charge of stealing a car last year.

Police arrested Melissa Davis when she went to Tyson Foods to get her last paycheck. Police say she wouldn’t tell them where her husband went. She was charged at first with hindering apprehension and then later with capital murder.

Police say Evin Davis surrendered to McAllen, Texas, police after he found out his wife was in jail. Police don’t know why he wanted to assume Helmlinger’s identity, or whether Helmlinger knew of the plot and threatened to go to police with the information.

Evin Davis is in the Carroll County jail with no bond set. Melissa Davis is in jail in lieu of a $1 million bond.