NEW : DeSalvos ` ` outraged , and ` ` by secret DNA collection , their attorney says . ME : ` ` We have offered them DNA as recently as last year , '' the attorney says . DNA from a relative links Albert ##son to the last Strangler victim , Mary Sullivan . DeSalvo was never charged in the murder and was sentenced to death in 1973 .
NEW : DeSalvos `` outraged , disgusted `` by secret DNA collection , their attorney says . NEW : `` We have offered them DNA as recently as last year , '' the attorney says . DNA from a relative links Albert DeSalvo to the last Strangler victim , Mary Sullivan . DeSalvo was never charged in the killings and was stabbed to death in 1973 .