Catchfire (1990)

Plot:

An artist witnesses a Mafia hit and calls the police. At the police station she realizes that the Mafia has a man in the force, so she runs. Trailed by the police, who need her testimony, and a hitman hired by the Mafia, she goes to Mexico, where eventually she meets the hitman, who has become infatuated after studying her art and life to prepare for the hit.