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AP Exclusive: Parents of teen who shot friend say it was 'tragic accident'; jury to hear case

  • In this Wednesday, July 22, 2015 photo, Regina Culver stands outside the window of her Billings, Mont., home through which her 17-year-old son shot and killed a friend who was knocking on her son's window late at night. Culver says she doesn't think criminal charges are warranted in a case that prosecutors plan to put before a special coroner's jury. (AP Photo/Matthew Brown)

    In this Wednesday, July 22, 2015 photo, Regina Culver stands outside the window of her Billings, Mont., home through which her 17-year-old son shot and killed a friend who was knocking on her son's window late at night. Culver says she doesn't think criminal charges are warranted in a case that prosecutors plan to put before a special coroner's jury. (AP Photo/Matthew Brown)  (The Associated Press)

  • In this Wednesday, July 22, 2015, photo, Regina Culver points to the window of her Billings, Mont., home through which her 17-year-old son shot and killed a friend who was knocking on her son's window late at night. Culver says she doesn't think criminal charges are warranted in a case that prosecutors plan to put before a special coroner's jury. (AP Photo/Matthew Brown)

    In this Wednesday, July 22, 2015, photo, Regina Culver points to the window of her Billings, Mont., home through which her 17-year-old son shot and killed a friend who was knocking on her son's window late at night. Culver says she doesn't think criminal charges are warranted in a case that prosecutors plan to put before a special coroner's jury. (AP Photo/Matthew Brown)  (The Associated Press)

  • This undated photo provided by Regina Culver shows MacKeon Schulte, 15, of Billings, Mont. Authorities say Schulte was shot and killed after knocking on the window of a close friend, 17-year-old Seth Culver. Prosecutors plan to put the case before a special jury to help decide if criminal charges are warranted. (Regina Culver via AP)

    This undated photo provided by Regina Culver shows MacKeon Schulte, 15, of Billings, Mont. Authorities say Schulte was shot and killed after knocking on the window of a close friend, 17-year-old Seth Culver. Prosecutors plan to put the case before a special jury to help decide if criminal charges are warranted. (Regina Culver via AP)  (The Associated Press)

The parents of a Montana teenager who shot and killed a friend as he knocked on his bedroom window late at night say he shouldn't face criminal charges.

They told The Associated Press in an exclusive interview that the shooting was a tragic accident and they blame themselves for allowing the teen to keep a loaded revolver in his room.

The May shooting has revived the debate over the so-called Castle Doctrine that sometimes allows the use of lethal force to defend one's home. It's also raised questions about the 17-year-old shooter's easy access to the handgun, given his age.

Fifteen-year-old MacKeon "Mackey" Schulte was killed as he and another boy tried to wake up Seth Culver at about 2:30 a.m.

A prosecutor will put the case before a special jury to decide on charges.