Is this accurate?
The Butterfly Effect 3: Revelations" (2009)
This standalone film follows Sam Reide, a man with the ability to travel through time. He uses his power to help solve cold cases for the police, assisted by his sister Jenna.
Sam has strict rules about not changing the past, but he breaks them to save his sister's life. This decision leads to unintended consequences, altering the present in unexpected ways.
As Sam investigates a series of murders, he becomes entangled in a complex mystery involving his own past. He must use his time-traveling abilities to uncover the truth and stop the killer, while also dealing with the ripple effects of his actions through time.
The film explores themes of cause and effect, personal responsibility, and the dangers of altering the past, much like its predecessors, but with a new cast and storyline.
Yep. It was it.
Since I never saw the second one, I dont know the relation. @tokenizedsociety said it wasnt very good.