WEST PALM BEACH, Fla. (AP) - A Florida teenager didn't believe his best friend when he said he was going to kill his parents. He had heard the threats before.
He wasn't convinced hours later when Tyler Hadley, 17, confessed to him in gruesome detail how he had attacked his parents with a hammer, or when he pointed to their cars in the driveway, even though they were nowhere to be seen as dozens of teens held a rowdy party inside.
None of it seemed real, the friend told police, until he was led to the master bedroom to see the unthinkable: The bloody, lifeless bodies of Blake and Mary-Jo Hadley, dead on the floor.
The account of the unidentified friend, who ultimately tipped off police, is contained in an affidavit released by authorities Wednesday, in which the killings are described in horrific detail.
Hadley is charged with murder and being held without bond. His public defender entered a plea of not guilty on his behalf Wednesday.
Police say Hadley posted word on Facebook before the killings Saturday that he was having a party that night, and as many as 60 people eventually showed up.
Questioned by police, the friend, who has been identified only as "MM," said Hadley told him he stood behind his mother for about five minutes Saturday as she sat at a computer. He contemplated her killing before finally plunging into her head with a hammer, according to the police documents.
Screaming, the mother mustered one final question to her son, according to the friend's account: "Why?"
Hadley's father came to the room, locking eyes with the attacker for a moment before the teen began hitting him with the hammer, according to the friend.
The boy took his parents' cell phones away ahead of the attack so they couldn't call for help, according to his friend's account. When it was over, and the parents were dead, Hadley spent three hours cleaning up the blood, before hosting the party at his Port St. Lucie home, his friend told police, recounting what he'd been told. He was surprised how long the cleanup took.
Hadley's public defender, Mark Harllee, said Wednesday he couldn't comment further. "We're still looking at all the facts and all the paperwork," he said.
The lead prosecutor on the case, Tom Bakkedahl, said of the affidavit: "It's clear to us that there's sufficient facts to charge with premeditated murder."
The friend of Hadley's told police the suspect called him Saturday afternoon claiming he planned to kill his parents, a threat that "MM" didn't take seriously because it had been made in the past.
Later that day, the friend told police, Hadley made the same threat again.
At the party that night, Hadley asked the friend to step outside to talk and told him of the killings, according to the report.
"MM" described himself as incredulous before he was shown a bloody footprint in the garage and, ultimately, the bodies in the bedroom, police said.