http://mydeathspace.com/article/2007/11/21/Tracy_Burke_(31)_and_her_former_mother_in_law_were _shot_to_death_by_Tracy_s_estranged_husband
I hope those poor children didn't witness any of this. The article says that a 9-year-old boy called 911 and said that he'd heard gunfire the night before. Burke also shot and killed the family dog. They were in the middle of divorcing and apparently Tracy had said previously that she was scared of her husband.
One part of the article that confused me is that it says he killed Tracy and her former mother-in-law. I assume they mean his former mother-in-law.
RIP Tracy and Karen