FLORENCE, Ariz. — Arizona has executed an inmate for killing and dismembering his adoptive mother while he was out of prison on a three-day furlough.

Sixty-three-year-old Robert Henry Moormann was given a lethal injection at a state prison in Florence, despite appeals over his mental disabilities and how the state has changed and violated its own execution protocol.

Moormann beat, stabbed and suffocated Roberta Moormann in 1984 at a Florence motel that's just a minute's drive away from where Wednesday morning's execution took place.

He meticulously dismembered her body and threw the parts in trash bins and sewers throughout the dusty town, about 60 miles southeast of Phoenix.

Robert Moormann used his last words to apologize to his family and to the family of 8-year-old girl he kidnapped and molested in 1972.