1. If not Lizzie, then who? Only Lizzie had a good opportunity to commit the murders. At the time of her mother's murder (around 9:30 A.M.), household guest John Morse was visiting relatives, sister Emma was out of town, Andrew Borden was running errands around town, and maid Bridget Sullivan was outside washing windows. Only Lizzie was known to be in the house at the time of Abby Borden's murder. To commit both murders (Andrew Borden was murdered around 11 A.M.), an outside intruder would have either have had to hide in the house for 90 minutes or departed and then returned without being seen.
2. It looks like an inside job. Police found no signs of forced entry into the Borden home (despite the fact that the Borden's habitually locked their doors) and nothing appeared to have been stolen. No stranger was seen entering or leaving the Borden house on the morning of the murders.
3. Although Lizzie claimed to have been downstairs at the very time her mother was violently murdered upstairs, she said she heard no alarming noises--this despite her mother having been struck multiple times with an axe and falling to the floor.
