Sheila Grant (Valerie Baber) was a villainess from the 2018 film, Witness Unprotected (alternately titled, Fatal Close-Up). She was the mistress of married police detective Tom Walker.
As later revealed, Sheila had a previous affair with another married man, Mr. Reynolds. Other than being a habitual adulteress, Sheila was also revealed as a greedy villainess, as she was blackmailing Reynolds and extorting money from him in exchange for her silence on their affair. She was doing the same to Walker as well, and in the beginning of the film, the evil Sheila appeared with Walker, as they were spotted by photographer/freelance investigator Samantha Roberts (the film's main protagonist).
Sheila was prepared for a romantic tryst with Walker, but she was unaware that Walker had other plans. As she lied in bed, Sheila ended up shot to death by Walker as part of his plan to cover up his affair.