Is This What Set Tamerlan Off?

Tamerlan Tsarnaev won the New England Golden Gloves heavy-weight boxing championship two years in a row.  But because he wasn’t a citizen, just a legal resident, he wasn’t allowed to compete in the national tournament.

There seem to be conflicting reports whether Tamerlan gave up boxing when he fell under the influence of the radical Islamist “Misha,” or whether he got involved with Misha after he gave up boxing because he couldn’t compete at the national level.