QUINCY, Mass. (WHDH) -- A son charged with killing his father outside their Weymouth home was held without bail Tuesday.

Prosecutors said the argument between Michael Beaudry, 20, and his father, 58-year-old Ronald Beaudry, started over Michael Beaudry wanting to shoot a BB gun in the woods. That argument led to Ronald Beaudry's death.

Weymouth police said they arrived at the Beaudry home Monday afternoon to find Ronald Beaudry lying in the street in front of his house.

“There was blood about his head and the defendant was tending to him screaming to the police asking for help saying, ‘You have to save my dad. Dad, why did you make me do it? I didn’t mean to hurt him. I’m sorry, please help him,’” said prosecutor Lisa Beatty.

Documents show Michael Beaudry’s mother ran out of the home to find the scene screaming, “Michael, what did you do? What did you do?” and he responded, “Dad was coming at me, I hit him with a pipe.”

Michael Beaudry’s attorney said he was planning to make a bazooka with a 3-foot section of PVC pipe when his dad confronted him, apparently unhappy he had been shooting a BB gun.

“The kid ran out of the house, slowed down. The father then ran after him. When he turned around the father increased his pace. The kid swung. Dropped the father,” said defense attorney Jack Atwood.

Police said Michael Beaudry admitted having heated arguments with his father in recent months. He planned to join the army, but hadn’t done it quickly enough.

“As a result of the kid having no job, not getting into the military, it was building and building and building,” said Atwood.

On Michael Beaudry’s Facebook page he posted photos showing him in German military uniforms. In one photo he is dressed as a Nazi holding a can of beer.

“The only thing I saw him do was with his war games…They used to shoot the BB gun a lot before then he turned to the plastic,” said Walter Earp, a neighbor of the Beaudry’s.

Police say they have a videotaped confession from Michael Beaudry.

Defense attorneys argue Michael Beaudry is remorseful and the charges should be lowered from murder charges to manslaughter charges.