Did Tameran Tsarnaev murder two Jews along with his 'best friend'?

There's been a lot of talk lately about how Boston Marathon terrorist Tameran Tsarnaev may have murdered his 'best friend,' Brendan Mess, on the 10th anniversary of 9/11. At the same time, he may have murdered two Jewish men, one of whom was apparently observant (Hat Tip: Mike P).

Tsarnaev, who was killed in a shootout with police, was a close
friend of Brendan Mess, who was found murdered