Nursing home killer blames 'evil thoughts' After igniting a Sydney nursing home, Roger Dean told police he was corrupted by evil thoughts. MASS murderer Roger Dean professed his love for the elderly people in his care, only hours after he set off an inferno that killed 11 of them in an act he described as a "mistake." "I love the residents very much," he told police after the 2011 Quakers Hill nursing home fire. I have a really good rapport with them. Dean, who was a nurse at the home in Sydney's west, confessed his crime to police, saying, "I'm just corrupted with evil thoughts that made me do that." He admitted he used a cigarette lighter to start a fire in an empty bed in one wing, before setting fire to a bed in another room where residents were sleeping. Asked if he had thought the residents - Dorothy Wu and Dorothy Sterling, who perished in the blaze - would be harmed, Dean said he "didn't think that way." I just assumed it would be a small fire. I didn't expect it to be big," he said in a high, hesitant voice. Footage of Dean's police interview and some of his actions in the nursing home that night was released to the media for the first time on Thursday. Dressed in the same white shirt and black pants he wore when he started the blaze, Dean told police he helped other residents get out of the home, to try to make amends for his "mistake." Crown documents reveal Dean had stolen more than 200 prescription painkillers from the home the night before the fire. The theft was being investigated by police, and Dean persuaded firefighters to let him back into the building before he removed and destroyed evidence. In his initial police interview, Dean gave a different account, saying he had not been accused of taking the drugs. He said he had found himself "bargaining with the antichrist," that Satan made him do it and that he had brought a Bible to work because he felt he was under attack. On the first day of his Supreme Court trial on Monday, Dean, 37, pleaded guilty to the murders of the 11 residents who died from the fires he lit at the home on November 18, 2011. Three residents died in the fire and eight died later from their injuries. He also admitted causing grievous bodily harm to a further eight residents who were injured in the blaze, described by paramedics and firefighters as one of the worst scenes they had ever come across. "It was just something stupid and something that I wish I'd never done," Dean told police. His case will return to court on Thursday.