Double killer executed in Oklahoma for deaths in 2002

Michael Dewayne Smith denied the killings (Oklahoma Department of Corrections/AP)

A man convicted of shooting and killing two people in Oklahoma City more than two decades ago was executed on Thursday morning.

Michael Dewayne Smith received a lethal injection at the Oklahoma State Penitentiary in McAlester and was pronounced dead at 10.20am, Oklahoma Department of Corrections spokesman Lance West said.