Jonathan Joss’ suspected killer admitted to the crime, per the police report obtained by The Post.

The “King of the Hill” voice actor, who played John Redcorn in the Fox animated series, was shot dead Sunday, June 1, after a heated argument, with his alleged shooter fleeing the scene.

The suspect, Sigfredo Alvarez Ceja, 56, was arrested blocks away from the murder and told law enforcement, “I shot him,” per the report, which also stated that a rifle was used in the fatal shooting.

Police said the incident started around 7 p.m. after a female drove the actor from Austin, Texas, to his old home in San Antonio, which burned down in February, with another passenger “to check on his mail.”

The woman told law enforcement that “she pulled in the driveway and parked her car,” which is where she waited for Joss and the other unidentified passenger for roughly five minutes. 

The female witness claimed Alvarez Ceja “pulled up in his vehicle and stop[ed] directly behind her car.” She said she witnessed Joss and the man “argue” from her rearview mirror.

Alvarez Ceja allegedly told Joss that he had a gun and threatened to shoot him before “intentionally and knowingly” discharging the weapon, resulting in the actor’s death, per the police report.

Alvarez Ceja has been charged with first-degree murder and is being held on a $200,000 bond.

While the rifle was the only weapon listed on the police report, the responding officer noted that the suspect’s “weapons were seized” before he was taken into custody.

Joss’ husband, Tristan Kern de Gonzales, spoke out following the tragedy.

He claimed he was with Joss at the time of the shooting and alleged the pair were set off after discovering their beloved dog’s remains in the rubble.

Joss’ husband, whom he tied the knot with earlier this year, also claimed that the fatal shooting was a hate crime — but police denied that accusation.

Joss was last seen in public two days before his death when he was reportedly escorted out of a theater during a “King of the Hill” event at the ATX TV Festival.

The star addressed the panel, which included the animated series’ co-creators Mike Judge and Greg Daniels.

After one of the creators introduced him to the audience, informing them that he voiced John Redcorn and was returning for the revival, Joss began walking toward the stage and across the front row to his seat, which is when security allegedly approached him.

“As Joss moved away from the mike to go back to his seat, that’s when security told him he had to leave and he exited the theater calmly and cooperatively,” the onlooker told People.

While he’s best known for his “King of the Hill” voiceover work, Joss also appeared as Chief Ken Hotate in “Parks and Recreation” alongside Nick Offerman, Chris Pratt, Amy Poehler, Rashida Jones, Aubrey Plaza and Adam Scott.

On Monday, Offerman revealed the “Parks and Recreation” cast had been “texting” about Joss’ murder “all day,” adding that they are “heartbroken” over the tragedy.

Pratt also paid tribute to his late co-star.

“Damn. RIP Jonathan,” the actor wrote on his Instagram story. “Always such a kind dude.”