Raphael Teken, one of the Jewish men murdered in 2011. Photo: Facebook.

Acquaintances of the Boston bombing suspect killed in a shoot-out with police Friday speculated Monday that he may have been involved with the murder of three Boston men in an unsolved case that dates to 2011.

At least two of the murdered men — Raphael Teken and Erik Weissman — were Jewish. (Friends of both Teken, 37, and Weissman, 31, maintain Facebook memorial pages in their honor.) The third victim in the September 2011 triple-homicide, Brendan Mess, was said by Tamerlan Tsarnaev’s acquaintances to have been his closest American friend.

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