Mark Kerrigan, 45, posted $10,000 bail and was released after undergoing a psychiatric evaluation. A judge has allowed him to live with his mother in the same Stoneham, Mass., home where the alleged incident took place.
Authorities say Kerrigan admitted to assaulting 70-year-old Daniel Kerrigan shortly before his death. Prosecutors have not said whether they will upgrade the assault charge after a Massachusetts medical examiner ruled Kerrigan's death as a homicide following an autopsy.
The Kerrigan family has disputed the medical examiner's findings, saying they "do not blame anyone for the unfortunate death of Dan Kerrigan."
-- Austin Knoblauch
The Associated Press contributed to this report.
Photo: Mark Kerrigan at his arraignment on Jan. 25. Credit: Ted Fitzgerald / Associated Press