He appears to kill for the sake of it, although investigators believe that sometimes he took small sums of money.
They suspect he had access to lists of addresses of pensioners and called on them, initially offering to help them.
Investigators fear that the just-released footage from October last year shows the 5ft 6 inches 'maniac' peeping into flats of possible future victims.
They issued warnings that he could strike again despite a lull of almost five years in his campaign.
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