(Covers information from the D.C. comics)
Dr. Peter W. Lengle was a psychiatrist whom Barry Burton was sent to see because of recurring nightmares about zombies. Unfortunately the hospital that Dr. Lengle's office was located in was built atop yet another underground Umbrella lab. An outbreak of the t-Virus occurred, and the building was soon overrun by zombies. Lengle was killed by one of them in trying to help contain the situation.