According to Dr. Llewellyn’s findings (the doctor who examined the corpse of Mary Ann Nichols), the killer was thought to be left-handed due to the direction of the knife wounds and the location of the facial and throat bruising. Dr Llewellyn’s initial belief that Jack the Ripper was left-handed became absorbed into Ripper lore, despite the fact many contemporary investigators and doctors disagreeing with this assumption, and even Dr Llewellyn himself retracting at some point his initial statement.