A man who refused to appeal his death sentence for killing his 4-year-old daughter and her 14-year-old half sister was executed tonight.

Daniel Lee Zirkle, 33, died by injection at 9:07 p.m. at the Greensville Correctional Center.

"I would just like to say that I'm sorry to everyone who's been hurt in this tragedy," Zirkle said in a statement after being led into the death chamber. "I also want to thank my family for their love and support, my lawyers, my preacher, for their help in getting me through this."

Zirkle killed his daughter, Christina M. Zirkle, in Page County on Aug. 2, 1999. Earlier that day, he fatally stabbed her half sister, Jessica L. Shifflett, in neighboring Rockingham County.

Zirkle and Barbara Jo Shifflett, the girls' mother, had lived together in Rockingham but were estranged. On Aug. 2, 1999, Zirkle had just been released from jail for violating a protective order by assaulting Shifflett.

A Rockingham jail inmate testified that Zirkle said he was "going to take care of all three of them when he got out of there. If he couldn't have them, nobody else would. He said he was going to kill them, all three."

While Shifflett was at work, Zirkle went to her home, stabbed Jessica and took Christina to an overlook on Storybook Trail in Page County, where he stabbed her and cut his own throat.

Zirkle admitted killing both girls and asked for the death sentence at both trials. He also refused to let his attorneys present mitigating evidence. He was sentenced to death for the capital murders of both girls, and he received a third death sentence for killing within three years of committing another murder.

Zirkle did not appeal his sentence. He was the second person executed this year in Virginia and the 85th since the U.S. Supreme Court allowed states to resume capital punishment in 1976.

Daniel Lee Zirkle, 33, stabbed his daughter and her half sister.