Dead of Knight

Suggestions:

The Dark Within The Medusa Touch Transmission 14: The Last Broadcast Transmission 23: The Return The Ghost of the Mikogami Festival

Someone is going medieval on Marla's friends, brutally killing them one by one. When she tries to tell people what's happening - a cursed medieval knight is on a rampage - no one believes her. She soon learns that she alone possesses the power to end the mayhem in a family heirloom - The Amulet of Thorns.