COLUMBUS, Ohio -- A condemned Ohio killer is challenging his death sentence on the grounds that the man who fatally stabbed the victim received a life sentence.

Austin Myers is sentenced to die for the 2014 killing in southwestern Ohio of childhood friend Justin Back, who was about to enter the Navy.

Authorities say the 18-year-old Back was killed during a burglary and his body dumped in a rural area.

Attorneys for Myers plan to argue before the Ohio Supreme Court Tuesday that his death sentence is disproportionate because of the life sentence given to co-defendant Tim Mosley.

Records show the 22-year-old Myers held Back while Mosley stabbed him.

Prosecutors say the case against each man must be addressed individually. They also say there's overwhelming evidence of Myers' role in planning the killing.