A man who shot his two young children as they laid in their beds and beat his wife to death before killing himself at their Westchester home last week legally bought the gun in April.
State police said Sam Friedlander, 50, bought the shotgun at a Yonkers, N.Y. sporting goods store six months before he shot his children, 8-year-old Gregory and 10-year-old Molly, on Oct. 17.
Friedlander also bludgeoned his wife, Amy, with a piece of furniture. He then turned the shotgun on himself in the basement of the family's four-bedroom Colonial-style house in Cross River.
The bodies were found Tuesday afternoon by a state trooper after someone at Sam Friedlander's office called out of concern when he didn't show up for work.
Police said the couple was in the midst of a divorce.
Police said people close to Sam Friedlander have told authorities he was acting irrationally in recent weeks, but said it was nothing that would have indicated such a violent spree.
Amy Friedlander and the children were mourned Saturday in a Pennsylvania funeral.