The older of two sons fatally shot his mother and brother before killing himself in an Apple Valley home this past weekend, according to court documents.
Relatives identify the three as Janice Petrovich, 60, Alexander Petrovich, 27, and 23-year-old Jonathan "Jack" Petrovich.
The Star Tribune reports Alexander Petrovich also killed the family's two dogs Saturday.
Family members and neighbors described Alexander as mentally ill and "subject to fits of rage and confrontational behavior," according to a search warrant affidavit filed Tuesday in Hennepin County District Court.
The state Bureau of Criminal Apprehension said evidence in the home supported the "murder/suicide scenario."
Police have handled at least two calls for service at the home since early last year, one for an unspecified issue with utility service and another regarding an issue with the dogs.