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“Past Imperfect” ñ An alleged serial killer, whose conviction rested solely on his confession to a cop, has his verdict overturned when Mac (Gary Sinise, right) jails his arresting officer, but Mac is floored and questions his actions when Sid (Robert Joy, left) reveals that the killerís signature is on the victim that heís examining, on CSI: NY, Wednesday, Apr. 25 (10:00-11:00 PM, ET/PT) on the CBS Television Network. Photo: Mitchell Haddad/CBS ©2007 CBS Broadcasting Inc. All Rights Reserved.