JACKSON, Ga. (AP) – A 38-year-old inmate who was convicted of killing two college students after confessing to his FBI agent father was executed in Georgia on Thursday, apologizing to the families of both victims before being injected at a state prison.

Andrew Allen Cook was pronounced dead at 11:22 p.m., about 14 minutes after he was injected with the sedative pentobarbital. He was the first inmate to be executed since the state changed its procedure in July from a three-drug combination to a single dose.