Right up until the moment he shot dead his mother and two siblings last September, Nicholas Prosper was seen as a loner - a socially awkward computer geek who kept himself to himself.
Nicholas Prosper, a 19-year-old, pleaded guilty to murdering his mother and two siblings in Luton. Neighbors describe him as a loner and a "warped teen" with deteriorating mental health who spent time online exploring disturbing content. His mother had sought help for him before the murders.
