Andrew Allen Cook died just before 11:30 p.m. at the Georgia Diagnostic and Classification Prison, The Telegraph of Macon reported. The execution was delayed 4 hours by a last-minute appeal to the U.S. Supreme Court.
"I would like to apologize to the victims' families," Cook said in his final statement. "I apologize, it was senseless. I'm sorry, I know y'all cannot forgive me. I'm not going to ask y'all to."
Cook, the son of an FBI agent, was 20 when he shot Grant Hendrickson, 22, and Michele Cartagena, 19, both students at Mercer University, with an AR-15 assault rifle and a 9 mm pistol. He did not know the couple, who were sitting in Cartagena's Honda at Lake Juliette near Macon.
Investigators linked him to the crime two years later through the guns and through DNA. After his arrest, Cook eventually admitted the crime to his father.
Cook also told a co-worker after he realized he had become a target of the investigation that he had committed murder "to see if I could do it and get away with it."
Celebrity Breakups and divorces of 2014 [PHOTOS]