Law & Order Criminal Intent; Bobby Goren/Vincent D'Onofrio

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What is going on with Vincent D'Onofrio's character? I have noticed a definiate change in his looks over the last season. Is this something going on in Vincent D'Onofrio's real life, or is it a change for his character? He has gotten fat, grey headed, and has this scraggly beard, he looks old and haggard. Do any of you L&O Criminal Intent fans know what's going on? I don't care how he looks, I still love to watch the man act, but there has sure been a change in a short period of time.