Man Pleads Guilty to Involuntary Manslaughter of NBCU Exec

Brian Russell Kaplon was shot by his friend David Andrew Armstrong during a St. Patrick Day party.

David Andrew Armstrong pleaded guilty Wednesday to involuntary manslaughter in the death of NBCU financial executive Brian Russell Kaplon.

Kaplon was shot by Armstrong as the two handled an AR-15 semiautomatic rifle during a St. Patrick's Day party at Armstrong's house in Porter Ranch, Calif.

The friends had been "drinking and laughing before the shooting and there was no sign of disagreement or anger," reports the Los Angeles Times.

Armstrong's lawyer says his client had a blood-alcohol level of .15 percent at the time of the incident.

Armstrong will be sentenced Nov. 30. He faces probation to 14 years in prison for the crime.

The death was originally ruled an accident caused by the mishandling of an AR-15 rifle, one of the many guns Armstrong was reportedly showing Kaplon in his garage.

Kaplon worked as a director of digital distribution finance at the NBCU's Burbank offices. He is survived by his wife and three young children, including a set of twins born after his death.

Kaplon's wife told the Times last month, "It's been horrific and surreal. Losing my husband in such a horrific manner is something nobody should have to go through. I just want justice for Brian."