Although he had underlying health conditions, the death of skater Nancy Kerrigan's father has been ruled a homicide.

Daniel Kerrigan, 70, died last month after an altercation with his son Mark. An autopsy revealed he died of a heart rhythm problem after the fight. Officials say he suffered a neck injury so severe it damaged his windpipe, killing him.

Mark has already been charged with assault and is currently undergoing a psychiatric evaluation. These new revelations could bring new charges against the 45-year-old.

Cops say Mark told them he put his hands around his father's neck during an argument and then Daniel fell to the floor. Family members had initially said Daniel had suffered a heart attack, adn his death was unrelated to the fight.

The autopsy also revealed Daniel Kerrigan suffered from high blood pressure and clogged arteries.

Dr. Ian Paul, an associate medical examiner for the state of New Mexico who is not related to the case, told the AP, "The assault itself would have caused significant physiological stress," Paul said. "It would have put direct stress to the heart itself because the heart is working faster, and in somebody with underlying heart disease, they would be at a much greater risk of experiencing sudden cardiac death."

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