John Allen Muhammad, the mastermind behind the Washington sniper attacks back in 2002, had been executed Tuesday via lethal injection, according to a Virginia prisons spokesman.

Muhammad had been declared dead at 9:11 p.m. ET, according to Larry Traylor, the director of communications for the Virginia Department of Corrections.

Muhammad was reportedly quiet the whole time, and the process went very smoothly. Traylor comments that Muhammad did not take the opportunity given him for last words, nor did he speak any words whatsoever ever since he entered the death chamber accompanied by guards at approximately 8:58 p.m.

“After [Muhammad] was placed on the gurney and strapped down, he was very emotionless,” according to a statement by Traylor.

Both Virginia Governor Tim Kaine and the U.S. Supreme Court denied motions to intervene in Muhammad’s case.

Muhammad leaves behind four children and two ex-wives.