Virginia executed a convicted cop killer Thursday night, despite claims that he suffers from a delusional disorder and requests for clemency from mental health advocates, the European Union and a victim's daughter.

William Morva was pronounced dead at 9:15 p.m. ET after an injection at the Greensville Correctional Center in Jarratt, Virginia Department of Corrections spokeswoman Lisa Kinney told reporters.

Morva was sentenced to death in 2008 for murdering security guard Derrick McFarland and Montgomery County sheriff's Deputy Eric Sutphin during an escape from custody in 2006.

Virginia Gov. Terry McAuliffe said earlier Thursday that he would not stop the execution.

One of deputy Sutphin's daughters urged the governor to grant clemency, saying she opposes the death penalty on moral and religious grounds. The deputy's mother, however, said she wanted the execution to go forward, NBC News reports.