UPDATE 6:

  08.49: The names Sunil or Sunny have been heard on the
  Boston police scanner tonight referring to Suspect No 2,
  the man who is still on the run. Sunil Tripathi, a
  philosophy major at Brown University has been missing for
  a month. Local press reports say that Boston police have
  identified him as a suspect.

  Mr Tripathi is described as a left-wing Marxist of 
  Indian Brahmin descent, whose father is a successful
  software developer. His family set up a Twitter account
  and a Facebook page last month to help the search for 
  him. Mr Tripathi was first identified as a suspect in a
  crowdsleuthing exercise on the Reddit website.

  The other suspect, who was wearing the black hat, has 
  been named as Mike Mulugeta. He is thought to have died 
  in hospital after a shoot-out with police.

  Their identities have not been officially confirmed.

Source:

http://www.thetimes.co.uk/tto/news/world/americas/article374...