A Texas man convicted of killing his ex-girlfriend and her new boyfriend died by lethal injection Wednesday evening, marking the first US execution of the year. 5 Charles Victor Thompson, 55, who was convicted of killing his ex-girlfriend and her new boyfriend, died by lethal injection Wednesday evening. Texas Department of Criminal Justice/AFP via Getty Images5 Darren Keith Cain died at the scene, while Dennise Hayslip died one week later. Cain died at the scene, while Hayslip died one week later. 5 Condemned prisoner Charles Victor Thompson talks from death row during an interview on Dec. 14, 2005, in Livingston, Texas.