The octogenarian charged with shooting a 16-year-old boy at his front door — after the teen rang his doorbell — is now behind bars.

Kansas City Police said Andrew Lester, 84, turned himself in on Tuesday and was placed at the Clay County Detention Center, about five days after he shot Yarl in the head and arm outside his Missouri home.

The Clay County Prosecutor’s Office charged the man with first-degree assault and armed criminal action on Monday, with an arrest warrant issued shortly afterwards.

He is being held at the detention center on a $200,000 bond.

According to the probable cause affidavit, Lester told police he was going to bed when Yarl rang his doorbell on Thursday night, alarming the man.

He claimed he was “scared to death,” thinking someone was trying to break into his home when he fired at Yarl, who he described as a “black male approximately 6 feet tall pulling on the storm door handle.”

Yarl, however, maintains that he never touched the door and was outside the home to pick up his younger brothers, who were waiting for him at a nearby address.

Yarl told police he was instantly shot in the head, and when he fell to the ground, Lester shot him in the arm.

Yarl claimed Lester warned, “Don’t come around here,” as he fled, fearing he would be shot yet again.

The teen was discharged from the hospital days later, and his mother says he does little but cry in bed thinking about the shooting.

Lester’s arrest also came following days of protest and outcry.

The two felony charges facing Lester carry 10 to 30 years behind bars, or life in prison, prosecutors said.

According to the probable cause affidavit, Lester claimed he was defending himself, which would play into Missouri’s “Stand your ground” law.

According to the state’s self-defense law, a person may use physical and deadly force against another if they have a reason to believe that such force is necessary to protect “against death, serious physical injury or any forcible felony.”

Missouri’s “castle doctrine” specifically allows such action to be used in a person’s home, which will likely play into the case as Lester was inside his house when he fired at Yarl, who was standing outside.

It remains to be seen if Lester will be able to argue that he faced a legitimate threat when Yarl rang his doorbell.