This week: Steve Buscemi guest stars and a mob informant who should never have returned to Chicago, Neela faces the wrath of her colleagues when she presents Sheryl's case at an M & M, Morris does everything he can for a dying asian woman and her daughter, everything seems to be going Pratt's way, Luka punches out Moretti before getting back together with Abby, and Dubenko finally decides he's had enough of County