Anyone who knows about crime movie about killer imitating first killer is not Zodiac but similar?

IS A FEMALE DETECTIVE, SHE IS A RETIRED POLICE OFFICER, AND SHE IS NOW WORKING AS A TEACHER & SOMEONE WANTS TO STRANGLE HER IN THE WASHROOM, THIS GUY IS COPYING PREVIOUS MURDERS, IS NOT THE ZODIAC MOVIE I DON'T THINK IS Jamie Lee Curtis or Sigourney Weaver but is someone similar... Anybody??? please I can remember just that! I just saw like 20 mints of it...