"This kind of case is something I've never experienced, hope to never again.
I just want to say I hope these families find some peace and solace for these inexplicably brutal and horrific acts," Wittner said, according to the Journal.
He has been behind bars since 1979, when he was arrested in the death of 12-year-old Robin Samsoe of Huntington Beach.
New York police had long considered Alcala a suspect in the slayings of Crilley and Hover and had taken impressions of his teeth in 2003.
Alcala had lived in New York periodically between 19.
Her body was found in Westchester County, not far from her family's estate.
The Journal reported that many in attendance at Monday's sentencing wore stickers bearing the black-and-white photograph that initially appeared in stories about Crilley's death.