The New Criminologist - a good source for all sorts of topics relating to crime and murder, along with exclusive footage of interviews with notorious serial killers on CD.
MurderUK - a site similar to this one, dealing with murders in the UK only. Covers many murders not yet covered here.
Crime Library - A comprehensive encylopedic website covering cases in geat detail. A very useful source.
Alternatively, you could email me your queries.