One of Our Own - S2.E2

A uniform cop is shot in a restaurant. The assumption is that the cop was shot because he knew too much, but it was actually mistaken identity. The B story is that the precinct is going to field a softball team. Of course, Cagney wants to play and drags Lacey along. Isbecki is the captain and tries to keep them out but eventually has to allow them in when he learns that the team must include both men and women