BROOKFIELD, Wis.  — A man police suspected of killing three and wounding four by opening fire at a tranquil day spa was found dead Sunday afternoon following a six-hour manhunt that locked down a shopping center, country club and hospital in suburban Milwaukee.

Authorities said they believed the shooting was related to a domestic dispute. The man they identified as the suspect, Radcliffe Franklin Haughton, 45, of Brown Deer, had a restraining order against him.

Brookfield Police Chief Dan Tushaus said Haughton died of a self-inflicted gunshot wound and was found in the spa. Authorities initially believed Haughton had fled and spent much of Sunday looking for him.