See photos of Prieto and reaction on social media:
Serial killer Alfredo Prieto executed
Virginia serial killer executed by lethal injection: reports
This undated photo provided by the Virginia Department of Corrections shows inmate Alfredo Prieto. Virginia is poised to execute Prieto, a serial killer, who claims heâs intellectually disabled using lethal injection drugs from Texas because the stateâs supply of another controversial drug will expire the day before the execution is supposed to take place. (Virginia Department of Corrections via AP)
Alfredo Prieto is escorted into Fairfax County Police headquarters having been extradited here from California to face three murder charges. (Photo by Rich Lipski/The Washington Post/Getty Images)
Alfredo Prieto, convicted serial killer, executed at 9:17 pm ET in Virginia - @AP
The execution of Alfredo Prieto: Witnessing a serial killer’s final moments http://t.co/gzidu2dfc9
Tonight: Pray for Alfredo Prieto. Pray for those who were killed or hurt as a result of Alfredo's actions. Pray for a more just world.
The death penalty is a "legally mandated and guided process" until the law gets in the way. #AlfredoPrieto executed with appeals pending.
Virginia has executed Alfredo Prieto. He is the 22nd person executed in 2015 and the 1,416th person executed in the post-Furman era.
Another execution. #AlfredoPrieto
Another mass shooting. #UCCShooting
Jesus, heal this land. https://t.co/pUEEgylOCn