Felton's murder investigation involves the whole squad plus Falsone from Auto and Gharty from IID (Felton had been undercover). Actually, Howard and Russert are shut out because of their personal involvement with Felton. Gharty and Falsone discover they have both had the same snitch and hone in on his possible role in the murder. Written by
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Melissa Leo was forced to leave her regular role as Sgt. Kay Howard due to a bitter divorce, but Leo stated that neither the show nor NBC forced her to leave, stating that she could no longer reside in Baltimore due to a need to return to New York for legal reasons. See more