Ghost (1990)

Plot:

Sam Wheat was murdered during a date with his girlfriend Molly. Sam's spirit, in a mysterious manner, remains on the Earth, unseen to normal people. After following his murderer, Sam realizes that his death was not an accident, and that molly is in danger. Sam's ghost try to warn Molly, but she does not know it is really there. Then he meets a spiritualist named Oda Mae Brown, who can hear the dead. Sam speaks to hear and convince her to help him save Molly.