Fan Casting See No Evil, Hear No Evil (1990)

Wally Karue is a blind man looking for a job. Dave Lyons is a deaf man who runs a newsstand. When Dave hires Wally, he never imagines they'll have to work together to survive. After a murder occurs at their newsstand, they figure out who the killer is with their collective senses -- but the investigating detective pegs them as the main suspects. When the real killer returns to cover her tracks, the two must really cooperate to live.