WOBURN, Mass. (AP) -- A defense lawyer for the brother of Olympic skater Nancy Kerrigan has told a jury that prosecutors have not proven that he triggered his father's fatal heart failure.
Mark Kerrigan is charged in the 2010 death of his 70-year-old father, Daniel Kerrigan.
During closing arguments Monday, Mark Kerrigan's lawyer, Janice Bassil, told the jury that prosecutors have not shown that Mark Kerrigan grabbed his father around the neck with such force that it fractured cartilage in his larynx and triggered his heart to go into a fatal cardiac dysrhythmia.
Bassil said Daniel Kerrigan died because he had severely blocked coronary arteries.
Prosecutors are set to make their closing argument later Monday morning.
The Kerrigan family has supported Mark. Nancy Kerrigan has been in the courtroom every day of the trial.