"He seemed like a very quiet, unassuming young man," McMasters said. "It is very surprising and shocking to see the destruction that he has brought to the city."
Last year, McMasters was deployed to Afghanistan with the Army National Guard and, when he returned to the job in August, Dhzokar was no longer on the staff or the schedule, he said.
Not everyone had good things to say. The harshest comments Friday came from the brothers' uncle.
Ruslan Tsarni told reporters outside his home in Montgomery County, Maryland, that he had not seen the Tsarnaev family since December 2005 and last spoke with them in 2009.
Asked what might have motivated the people who did the attack, he said: "Being losers; hatred to those who were able to settle themselves. These are the only reasons I can imagine."
Though the family is Muslim, their religion played no role in the attacks, the uncle insisted.
"Anything else to do with religion, with Islam, it's a fraud, it's a fake," he said.
He described the family as peace-loving, ethnic Chechens.
"Somebody radicalized them, but it's not my brother, who just moved back to Russia, who spent his life bringing bread to their table, fixing cars," he said. "My family had nothing to do with that family. Of course, we're ashamed, yes, we're ashamed they're children of my brother."
The Brothers Tsarnaev, said Tsarni, had brought shame on the Chechen people.