Statistically speaking, it is police officer who becomes a fatality in Domestic violence calls like this. Story in Connecticut Post
However in this case the alleged perpetrator, a well liked attorney Christopher Andrews, was fatally shot by the Fairfield Police Department. Very little is known about the shooting other than the fact that Andrews had assaulted his wife and child with a knife and blunt force trauma prior to being shot by visiting police.
More as the case develops.