Often returns to the scene of the crime to gloat. Plans crime, and targets a stranger. Likes to maintain control over everything - tortures victim, removes body from scene of death and disposes of it May take souvenirs of the crime, including body parts. The killer is normally someone who lives close to the murders scene, or who knows the victim. Crime scene is sloppy - body left where it fell, and weapon left too.
Violence is sudden - no torture before death, or restraints.
Often sexually asaults victim after death, or mutilates it. This often depends on age. Younger ones will often remove clothes and look at and touch the sexual organs but don't damage them. They feel threatened by, and fascinated by, sexual organs. It's an attention seeking way of doing a crime.