Authorities have closed their investigation of a fatal Christmas day shooting near Waterloo without filing any charges in the case.

Black Hawk County sheriff's officials released additional details on the incident Tuesday. In a press release, they confirmed that the victim's father, 69-year-old David Buck, was the family member who shot and killed 43-year-old Chad Buck at 1347 E. Airline Highway. Authorities said Chad Buck lived in the home with his parents.

Sheriff's officials said their investigation revealed that an argument took place between Chad Buck and David Buck, who was in a frail medical condition. According to authorities, the altercation was heated and progressed to the point in which David Buck was concerned for his safety.

In the press release, officials said Chad Buck threatened to kill his father. That's when David Buck shot his son. A short time later, Chad Buck was pronounced dead at a local hospital.

Authorities said David Buck and his wife, Kay, both asserted that the shooting was an act of self-defense. Officials confirmed they have closed their investigation of the deadly shooting.

An ambulance was called back to the house on Monday around 2 PM for another medical emergency. In the press release, officials said David Buck was suffering a cardiac episode and emergency personnel performed CPR in an effort to save his life. Buck was taken to a local hospital, where he later died.

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