Deathkeeper

"Luke, a near-immortal angel who stands on the side of good, is eternally cursed and only ages when he saves lives. However, as he ages, he can only become young once again by taking a life. He is stalked through time by the charismatic but deadly Malagor, a disguised demon who wants his powers. A series of murders ensues whilst Malagor amasses an Army of the dead. Only Luke can defeat him in a battle of good vs evil. Luke must also protect the innocent, aided by a love interest, a troubled cop, a local priest, and the mysterious wanderer."