A convicted killer confessed to being a “homicidal maniac” at his Florida sentencing hearing, then begged to be executed rather than continue getting “brutalized” in prison.

Scott Edward Nelson, 55, gave startling testimony on Monday after he was found guilty of kidnapping nanny Jennifer Fulford, 56, and then stabbing her to death during a robbery, according to the Orlando Sentinel.

Instead of expressing remorse, the career criminal turned the sentencing into a pity party over his time behind bars — surprising even his own lawyers when he asked for the death penalty instead of life in prison, the report said.

“I’ve been brutalized,” Nelson said, adding that he had been “treated like an animal for 25 years” while incarcerated over his lengthy rap sheet. “There’s nothing you can dream up that hasn’t been done to me in federal custody.”

He claimed he had been beaten unconscious and raped in prison, where he claimed he contracted hepatitis C.

But Nelson also complained in court about being locked in small cells with two other inmates and no fans or air conditioning during 100-degree weather, as well as fire alarm sprinklers regularly going off, the Sentinel said.

He even claimed he’d been tied “like a dog” to a bed on Christmas by an officer dressed as Santa Claus, telling the court, “He was a mean Santa.”

Nelson, previously jailed for robberies in 1994 and 2010, said he wanted the jury to know what “25 years in prison has done to me and what it’s going to do to me in the future,” according to the report.

“I want them to know what is going to happen if I get life in prison,” Nelson said. “This is important to me. This is the only reason I wanted to testify.”

His lawyers objected to his unexpected request for the death penalty and jurors were told to disregard his comment, the report said. His sentence has yet to be decided.