Convicted serial killer Clifford Robert Olson is dying of cancer and has only days to live, according to the families of some of his victims. Sharon Rosenfeldt says Don Head, the commissioner of Corrections Canada, called her on Tuesday with news of Olson's fading health. She called the situation bittersweet, saying she's still in shock and asking: 'Will it really be over?' Olson, who's now 71, was transferred from a maximum security prison in Quebec to a hospital in Laval. Ray King, whose son Ray Jr. was murdered by Olson, said "at last we'll get a break from him constantly interfering in our lives." He added, "it'll give us a chance to heal, which we haven't had in the past 30 years." Olson is one of the most notorious serial killers in Canadian history. In 1982 he confessed to 11 killings, male and female victims as young as nine years-old centered around the Vancouver area, including Rosenfeldt's son, 16-year-old Daryn Todd Johnsrude.