(CNN) A convicted murderer in Georgia has asked that he be executed by firing squad, arguing an execution by lethal injection would cause him "excruciating pain" because of the condition of his veins.

Michael Wade Nance was convicted of malice murder and other crimes for the 1993 murder of Gabor Balogh after robbing a bank, according to The Atlanta Journal-Constitution

Michael Wade Nance, seen in this photo from the state Department of Corrections, wants to be executed by firing squad.

On Wednesday, Nance's attorney filed a complaint in the US District Court for the Northern District of Georgia, arguing Nance's veins are "unsuitable" for injection because they are hard to see, "heavily scarred" and have "thin walls."

If the state were to attempt to execution by lethal injection, his veins could "lose their structural integrity ... leading to the leakage of the lethal injection drug into the surrounding tissue," the lawsuit says.

Additionally, Nance uses a prescription drug to treat chronic back pain. The lawsuit claims the drug has changed his brain chemistry to the point the drug pentobarbital may not adequately render him unconscious.