Dismemberment Suspect Accused

A while back a British teenager was found dismembered and her torso stuffed into a suitcase. They have picked up a Brazilian man who is accused of doing this. He says he doesn't remember most of what happened that night she died because he was high on cocaine. Then he guided the police to the remote area where he allegedly tossed her head and arms and legs from a bridge. But earlier Friday, he denied that he had killed her when he talked to reporters. This sort of thing sees to be common on the news today. Beheading is becoming almost commonplace all over the world. What is going on?