A man whose frenzied knife attack left his former girlfriend and three of her siblings dead was executed by injection Friday.

Leopoldo Narvaiz Jr. was put to death just hours after Gov. George W. Bush spared the life of death row inmate Henry Lee Lucas, commuting his sentence to life in prison after doubts about his guilt were raised. It was the first time the Republican governor had commuted a death sentence.Narvaiz was convicted of using butcher knives to hack to death the four victims - ranging in age from 11 to 19 - in San Antonio.