A scorned husband isn’t denying a thing — admitting he set fire to a Virginia lawmaker, accusing him of an affair with his wife, Mary Alice … even though she’d already filed for divorce weeks before the attack.

Yup, we finally got the why behind Shotsie Michael Buck-Hayes‘ alleged actions — laid out by a Danville PD investigator during Tuesday’s prelim hearing, months after his July arrest.

Shotsie flat-out told cops he bought gas to kill Danville City Council member Lee Vogler — then used a lighter to spark the blaze.

Three witnesses took the stand — including a Showcase Magazine employee, who said Buck-Hayes stormed in with a bucket, chased Vogler, and doused him with gasoline while he was working his day job as a sales director.

Vogler’s wife, Blair, told the court he suffered second and third-degree burns over 60% of his body — plus burn shock, septic shock, and lung damage from the smoke.

He’s been hospitalized ever since, still fighting through recovery.