An accused transgender terror plotter who allegedly planned a massacre at a Las Vegas-area casino had threatened a mass shooting years earlier, according to chilling audio recordings released by police.

Allison Howlett, 36, who was born male but lives as a woman, was arrested Saturday with a massive cache of guns and ammunition in a casino parking garage in Henderson just outside Las Vegas.

The suspect’s former spouse had called police to report that Howlett intended to commit “suicide by cop” or carry out a mass shooting, Henderson Police Chief Reggie Rader said.

After the arrest, authorities revealed that Howlett threated of a mass shooting as far back as 2024, playing an audio recording of the suspect unleashing a frightening foul-mouthed rant.

“I swear to God, if the FBI doesn’t come f—king arrest me, there’s gonna be a f—king mass shooting,” Howlett is heard saying in the recording, according to law enforcement.

Howlett then grows more agitated, adding: “There’s one day you’re gonna be pissing me the f—k off, and it’s gonna be the last f—king straw.

“You’re going to the be reason that hundreds of people lose their goddamn life.”