what movie was about a slow kid training to be a hit man?

Question

the mob wanted a new hiter so they promoted there numbers runer to the job.there curent hiter has to train him.the kid is a bit slow but he is real good at math,kept track of the numbers game in his head.in the end he has to kill his trainerand the mob bosses so he can be with the girl he just fell in love with

the older hit man traning him tells him at one point,befor he kills one of his first marks, "your to close" at the end win the young man has to kill his metor the older one tells him again,"your too close"the younger responds "i know" and pulles the triger any way splatering himself in the face with blood

Answer 1

"Coldblooded"
http://www.imdb.com/title/tt0112702