The Butterfly Effect (El efecto mariposa)

Sam Reide has the ability of traveling to the past and works with the police department solving unresolved crimes, witnessing the events with the support of his sister, Jenna Reide and reporting the criminal's identity to detective Dan Glenn. When Elizabeth Brown, the sister of his former girlfriend Rebecca Brown that was murdered a couple of years ago pays a visit to him, she tells him that she has just found Rebecca's journal with evidences that Lonnie Flennons, who was accused for the murder is innocent. Sam decides to witness the murder of Rebecca and his interference affects the future. He travels to the past to try to fix his mistakes, but every time he returns, the future is in worse condition.