Why did the boondock saints have to have Norman reedus in it?

Norman Reedus was cast as Murphy MacManus in "The Boondock Saints" due to his strong screen presence and ability to portray complex characters. His performance brought a unique blend of intensity and humor to the role, enhancing the film's dynamic. Additionally, Reedus's chemistry with co-star Sean Patrick Flanery contributed to the film's cult appeal. Overall, his involvement played a significant role in shaping the film's legacy.