MILWAUKEE — Wisconsin legislators sent a letter to a suburban police chief accusing his department of allowing a man who fatally shot his wife and two others at a spa to elude accountability in his past run-ins with the agency.

The letter asks for an independent and transparent investigation of the Brown Deer Police Department’s interactions with Radcliffe Haughton and the department’s domestic violence policies and practices. Haughton opened fire on Oct. 21 at the Brookfield spa where his wife, Zina Haughton, worked and then killed himself.