Dr. Williamson did not believe in miraculous recoveries and told Phoebe and Prue that their sister would not survive if she didn't come out of the coma she'd slipped into. He was surprised when Piper seemingly survives without any medical explanation and believes that the secret to saving other people that mysteriously came down with the disease is in the sisters' blood, though it was really a spell that had caused the disease to spread throughout the hospital. Even though Piper suddenly succumbs to the disease again and dies, Dr. Williamson is left with his questions when she comes back to life.