tamerlan tsarnaev's uncle says a friend from cambridge may have brainwashed his nephew, a man known only by the name misha. but what role if any did he play in possibly radicalizing tamerlan tsarnaev? cnn's brian todd takes a closer look. >> family members now describe a mysterious man who they say had a mesmerizing influence on tamerlan tsarnaev. they only know him as misha. they say they don't know his full name. here is how the suspect's uncle described the man and his influence on the other brother in an interview with cnn. >> a new person in convert of islam of armenian decent. this person just took his brain, brainwashed him completely. tamerlan is off now. there's no obedience to respect his own father. that concerned me big time.