No, this guy is a real sicko. He bashed in the face and head after mutilating the torso. Then for a grand finale he severed both of the legs.
From the description of the murder scene I would say that this guy had a lot of hate in him and is just plain evil.
From the description of the murder scene I would say that this guy was out of control. That could be explained by something as simple as a sudden shock during what was intended to be an amorous encounter. It certainly doesn't justify murder, but it could easily explain an unusual level of violence and rage during and after the murder.