Defense Rests In Kerrigan Manslaughter Trial

The defense in the manslaughter trial of Olympic skater Nancy Kerrigan's brother has rested its case. Mark Kerrigan is charged in the January 2010 death of his 70-year-old father, Daniel Kerrigan.

Kerrigan's lawyers wrapped up their case Friday after a cardiologist testified he believes that Daniel Kerrigan's heart began to fail before he got into a physical struggle with his son.

Prosecutors allege that it was the physical altercation that triggered Daniel Kerrigan's heart failure. Mark Kerrigan allegedly told police that he grabbed his father around the throat. Prosecutors say he did so with such force that it broke cartilage in Daniel Kerrigan's larynx.

The family says the father died because of a longstanding heart condition.

The jury is expected to begin deliberating Monday following closing arguments.