06/27/2011 07:52 am ET Updated Aug 27, 2011

'Person Of Interest' Jay Rosenbaum Not Interested In Helping Hunt For Missing Indiana University Student Lauren Spierer

His silence is deafening.

More than three weeks after Westchester college student Lauren Spierer vanished during a night out partying at Indiana University, Jason "Jay" Rosenbaum -- the last person to admit having seen her alive -- has ignored her parents' pleas for information that could lead them to their daughter, family friends told The Post.