Eyewitness(1981)

NYC custodian Daryll Deever is a big fan of local news reporter Tony Sokolow, so he is intrigued when she shows up to cover a story at his workplace. There's been a murder in the office building, and Tony suspects that Daryll may have insight into the crime, a notion that he furthers to stay close to her. However, when those behind the killing begin to think that he really knows something, they target the pair to keep their secrets hidden.