The Missouri Supreme Court has refused to overturn the conviction of Kenneth Baumruk, who was sentenced to die for killing his wife and wounding four others in a 1992 St. Louis County Courthouse shooting rampage.
It wasn't clear if the Missouri Attorney General's office would seek an execution date following the ruling on Tuesday. A spokeswoman declined comment. Baumruk's attorney did not return a message seeking comment.
At 73, Baumruk is the oldest man on Missouri's Death Row.
Baumruk was initially ruled incompetent for trial because of the head injuries suffered when he was shot by police. He was found guilty and sentenced to die in 2001, but the case was thrown out. A retrial in 2007 also ended with a guilty verdict and death sentence.