City News Service says Sgt. Brian Weir filed the suit Monday in Los Angeles.
Houston was 48 when she drowned in a bathtub at the Beverly Hilton two years ago. Weir contends that a detective sergeant kneeling by the singer's body removed a sheet and remarked that she was "still looking good," along with similar comments.
Weir says that when he reported the alleged remarks, he was harassed, removed from the SWAT and K-9 units and denied promotions.
Police Lt. Lincoln Hoshino says he wasn't aware of the lawsuit but that he considers similar claims Weir made earlier to be baseless.