CSI: NY

Season 7, Episode 4

Episode Title: Sangre Por Sangre

Air Date: 2010-10-15

Overview:

When the leader of a powerful New York gang, El Puño, is found murdered, the CSIs must find the killer before a street war with a rival gang breaks out. Mac asks the co-founder of El Puño, Luther Devarro, a man he put behind bars years before, for help.