Photo: The Canadian Press

Texas carried out the nation's first execution of 2018 Thursday evening, giving lethal injection to a man who became known as Houston's "Tourniquet Killer" because of his signature murder technique on four female victims.

Anthony Allen Shore was put to death for one of those slayings, the 1992 killing of a 21-year-old woman whose body was dumped in the drive-thru of a Houston Dairy Queen.

In his final statement, Shore, 55, was apologetic and his voice cracked with emotion.

"No amount of words or apology could ever undo what I've done," Shore said while strapped to the death chamber gurney. "I wish I could undo the past, but it is what it is."

As the lethal dose of pentobarbital began, Shore said the drug burned. "Oooh-ee! I can feel that," he said before slipping into unconsciousness.

He was pronounced dead 13 minutes later at 6:28 p.m.

"Anthony Allen Shore's reign of terror is officially over," Andy Kahan, the city of Houston crime victims' advocate, said, speaking for the families of Shore's victims. "There's a reason we have the death penalty in the state of Texas and Anthony Shore is on the top of the list. This has been a long, arduous journey that has taken over 20 years for victims' families."