LEBANON, Mo. (AP) — A southwest Missouri teenager has died days after a shooting that also claimed the life of his father.

Laclede County Coroner Steve Murrell says 15-year-old Riley Gerber died Saturday from a gunshot wound he suffered Tuesday at his home in Grovespring. Gerber's father, Chad Gerber, died at the scene from a gunshot wound.

Sixty-five-year-old Matthew Mitchell Rumbaugh of Mountain Grove has pleaded not guilty to murder, assault and armed criminal action charges connected to the shooting. The Springfield News-Leader reports (http://sgfnow.co/1ygtWId ) the assault charge could now be upgraded to a second murder charge.

Deputies say Rumbaugh shot the Gerbers last week because he was tired of waiting for Gerber's wife to leave her husband.

Rumbaugh has been denied bond in Laclede County.

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Information from: Springfield News-Leader, http://www.news-leader.com