"Jim cleaned it up and recorded it but had a dentist's appointment that afternoon (for a filling) [...]" Sometimes Wikipedia really tries to relay all of the most important information.
...and am looking forward to an update in which we learn the name and then age of the undergraduates that dug them up and what pranks they played with them.
https://web.archive.org/web/20101112065654/http://www.ucl.ac...
Ritual killings have elements not related to the act of killing, serial ritual killings demonstrate a repeated pattern of ritual .. it's killing with obsessive complusive and|or psycho sexual flourishes.
Ritual murder = we kill because it's our custom; e.g. captured warriors could get killed to celebrate victory.
Human sacrifice (a form of ritual murder) = we make an offering and we expect certain rewards. E.g. we sacrifice 100 citizens because we believe we need to meet a quota and otherwise the sun won't go up.