Police: Pa. man, 76, kills grandson, 19

RENFREW, Pa. - October 1, 2012

Police haven't said what sparked the argument that led to the shooting death of Austin Riddell in Connoquenessing Township, Butler County on Friday.

State police say Riddell's 76-year-old grandfather, Larry Karnes, shot Riddell in the chest with a .22-caliber rifle. Butler County Deputy Coroner Denny Trzeciak says Riddell was a large man and he found it unusual he was killed by a single wound of a small-caliber firearm.

The cause of Riddell's death is pending the results of toxicology tests.

Karnes is charged with criminal homicide. It's not clear if he has an attorney.

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