Martin Scorseses Goodfellas tells a true story, and it takes some unexpected turns throughout its third act leading up to the end. In 1990, Martin Scorsese brought another gangster film with Goodfellas, based on the 1985 nonfiction book Wiseguy, by Nicolas Pileggi. With a script by Scorsese and Pileggi, Goodfellas chronicles the rise and fall of mob associate Henry Hill (played by Ray Liotta), from his days as a teenager running errands for Paul Cicero (Paul Sorvino) and his people to becoming a member of their crew.

https://screenrant.com/goodfellas-movie-ending-explained/