CHICAGO — The estranged wife of a gunman who burst into a day spa and started shooting was among the three women he killed, officials said Monday.

The suspect -- identified as 45-year-old Radcliffe Haughton -- was later found dead of a self-inflicted gunshot wound at the scene in Brookfield, a suburb of the city of Milwaukee, police said.

The Waukesha County medical examiner's office identified Zina Haughton, 42, as being among the dead. Also killed were Cary Robuck, 35, and Maelyn Lind, 38.

Four other people were injured in Sunday's shooting.

Women who were trying to relax by getting massages and nail treatments instead ran for their lives when the gunman entered the Azana spa, police said.

Clients stood dumbfounded in the parking lot in their white spa robes outside the locked-down crime scene, as police spent hours combing the large building, which had many small treatment rooms.

Police said Haughton's wife apparently wanted a divorce and he had slashed her car tires this month, prompting her to take out a restraining order against him.

The suspect's father, Radcliffe Haughton Sr., told TMJ4 News: "This is not the way I raised my son... My son is facing a domestic problem. Things happen, and some people cannot take it."