Defense lawyers for Olympic skater Nancy Kerrigan's brother are asking a judge to throw out statements he made to police after the death of their father last year.

Mark Kerrigan has pleaded not guilty to manslaughter in the case.

Prosecutors say 70-year-old Daniel Kerrigan was fatally injured in a violent fight with his drunken son at the family's Stoneham home. Kerrigan's lawyer and family say his father died from a longstanding heart condition and his son was not responsible.

Kerrigan's lawyer says he was so intoxicated when police first questioned him that he could not have voluntarily waived his right to silence.

At a court hearing Thursday, a police officer testified Mark Kerrigan yelled vulgarities when officers tried to handcuff him as emergency medical technicians tended to his father.