Vincent Darrell Groves is Colorado's most prolific serial killer. He was caught after a man watched him dump a body in an alley behind his house and police stalked him like a shadow for years. He was arrested for one murder and released, only to kill many times over. He wasn't so much cunning as he was utterly invisible and spontaneous, killing any woman who he saw an opportunity to attack. The full extent of his crimes would only be realized in 2010, but that isn't the end of them.