Dane Gill, right, participates in a silent vigil outside the Governor's Mansion in Oklahoma City, Tuesday, May 1, 2012, in protest of the execution of Michael Bascum Selsor.
Dane Gill, right, participates in a silent vigil outside the Governor's Mansion in Oklahoma City, Tuesday, May 1, 2012, in protest of the execution of Michael Bascum Selsor. An Oklahoma man convicted of murdering a Tulsa convenience store manager almost 37 years ago was executed by lethal injection Tuesday. (AP Photo/Sue Ogrocki)