Not a disappearance, but I saw that Levi Bellfield allegedly confessed to the murders of Lin and Megan Russell in Chillenden, Kent. Michael Stone is in prison for this crime, he has always claimed innocence and the case against him seemed shaky.
Not sure how credible this confession is, it's from his solicitor. It doesn't seem like his normal MO which appeared to be young women walking home - not a family of three including young children.
He's not confessed to anything else, as I recall he hasn't admitted his part in any other murder. The press seem quiet about it too. Seems off to me, not sure why.