The Whistler (2006)

After their grisly murders, a lumberjack and his lover return a year later to enact deadly vengeance on those responsible. Soon, the members of a notorious inner city gang begin to die violently by the hands of an axe-wielding vigilante known as The Whistler. These brutal deaths land detective Kyle Rico and forensics investigator Jacy Hall hot on The Whistler's trail. But nothing is as it seems and the closer that they get to the truth, secrets are revealed that lead to an ultimate death struggle of ghostly proportions.