There was another cluster of killings around Christmas 1987, with three deaths in December and another two in the first half of January. In February 1988 the death rate was cranked up to four murders within a week. There was then a gap of seven months without a killing, possibly
because the four in one week had caused one of the other members of the staff at Donneybrook to comment. But he was back in business by the end of the year, again killing two elderly people in the run up to Christmas, just before they were each about to go to their families for the festive season. In 1989 he killed twelve patients. For the first time, he killed a patient in his own examination room.