The Big Mystery Remains: Who Is Responsible For Clare's Death in Passing?

Another possibility is that Irene may be responsible for Clare's death. She seems to be growing quite jealous of how friendly Clare has gotten with her husband, and she is clearly the most shaken up by Clare's death. During John and Clare's confrontation by the window, Irene is shown putting her arm across Clare when he runs toward her, though it's not clear if she is simply protecting her or if Irene actually pushes Clare toward her death. It's also worth noting that when everyone makes their way downstairs to check up on Clare, Irene is the last one to head down, and she immediately loses it when police begin questioning her.