21 July 2005 :

Michael Pennington, convicted of killing a store clerk during a 1991 robbery and blamed it on steroid use, was executed by lethal injection. Pennington, the third person put to death this year in Oklahoma, was condemned for murdering Bradley Grooms while robbing a Lawton, Oklahoma, convenience store on October 21, 1991. Pennington later said he was psychotic at the time of the crime because of anabolic steroids he took to enhance his weight-lifting regimen.He had no final words while strapped to a gurney awaiting injection.