The Tipoff

S1 E1: Mack, an old friend of Cody gives him a tip about a burglary in an arms store. Fiorelli and he try to catch the thieves, but one can escape. Apparently another old friend of Cody shows up: Jimmy Cotter. Cody gets a second tip of Mack, this time a false one, but later, Mack is found dead. Cody thinks that Cotter has something to do with it, and goes and talk with him.