The Wandering Soul Murders(2001)

Haunted by the murder of her politician husband 6 years ago, former police detective Joanne Kilbourn keeps looking for clues, with the help of her old partner. When a prime suspect is caught, it looks as if the killer may finally be brought to justice … but in a shocking turn of events, the suspect is gunned down as he's brought to the police station. Is there more to her husband's death than Joanne realized?