Nancy Kerrigan's brother Mark Kerrigan not guilty of manslaughter

Mark Kerrigan in court, May 19, 2011
AP Photo

(CBS/WBZ/AP) WOBURN, Mass. - A jury found the brother of Olympian Nancy Kerrigan not guilty of manslaughter in the 2010 death of their father Wednesday, but found Mark Kerrigan guilty on the lesser charge of assault and battery.

PICTURES: Nancy Kerrigan family tragedy

Mark Kerrigan, 46, was charged in the 2010 death of their 70-year-old father, Daniel Kerrigan.

A jury in Woburn Superior Court deliberated a little over 12 hours Monday and Tuesday, reports CBS station WBZ.

Deliberations resumed Wednesday morning. A verdict was reached around 11:30 a.m.

Prosecutors say Kerrigan caused his father's death during an altercation at the family's home in Stoneham, just north of Boston.

He is accused of grabbing his father around the neck with such force that he broke cartilage in his father's larynx and triggered heart failure.

Kerrigan's lawyers say Daniel Kerrigan died because he had severely clogged coronary arteries.

Nancy Kerrigan and her family have supported her brother.

Complete Coverage of Mark Kerrigan on Crimesider

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