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 Tsarnaev, 21, is accused of killing three people and injuring 264
with a pair of homemade pressure-cooker bombs left at the race's
crowded finish line on April 15, 2013, in the largest mass-casualty
attack on U.S. soil since Sept. 11, 2001.
The ethnic Chechen, who moved to the United States from Russia with
his family a decade before the attack, could be sentenced to death
if he is convicted of charges that also include the fatal shooting
of a police officer three days later as he tried to flee the city.
"The bottom line is you're not going to get a not guilty in this
case," said Jules Epstein, a Widener University School of Law
professor who has represented defendants in federal and Pennsylvania
death penalty cases. "I don't think the defense is arguing that. So
every move is with an eye on the end game and that is avoiding
death."
Tsarnaev has pleaded not guilty to all charges and his attorneys
have offered little detail on their case, with the bulk of both
prosecution and defense filings under seal in Boston federal court.
But legal experts said the defense will likely try to show that his
26-year-old brother, Tamerlan, an amateur boxer, who died following
a gun battle with police as the pair tried to flee Boston, was the
driving force behind the attack.
 SEEKING EMPATHY
Showing that he was heavily influenced by his brother could be a
mitigating factor that would persuade a jury to sentence Tsarnaev to
life in prison rather than death, legal experts said. For
prosecutors, the challenge is to show that he was fully responsible
for actions while not making any errors that could result in a
guilty verdict or death sentence being overturned on appeal.
"With someone who is so young, the strategy would be to try to
humanize him in front of the jury," said Deborah Denno, a Fordham
University School of Law professor who specializes in the capital
punishment.
"In a death penalty case...you try to humanize him as much as
possible to make it so the jury empathizes with him."
Finding the jury has been an arduous process, as eligible jurors
needed to be willing to consider imposing the death penalty, and not
have too personal a connection to the event.
The faces of Tsarnaev and his older brother as seen on a
surveillance video walking towards the site of the blasts carrying
backpacks that prosecutors contend held the bombs are burned into
the memory of Boston-area residents.
Thousands of people were crowded around the finish line when the
bombs went off and hundreds of thousands ordered to remain in their
homes for four days as police mounted a massive manhunt.
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Tsarnaev was found hiding in a drydocked boat, where he had written
a note suggesting the attack was an act of retribution for U.S.
military involvement in Muslim-dominated countries.
When the trial opens, prosecutors will be seeking to show evidence
that Tsarnaev understood his actions and played an active role in
planning and building the pressure-cooker bombs that ripped through
the crowd, tearing the legs off 16 people and killing spectators as
young as 10.
"If they indeed show that he ordered someone to do something or
actively participated in the discussion about where to place the
backpacks, made anti-American statements, that would hurt" the
defense, said Dean Weinstein, an attorney now in private practice
who previously brought death-penalty cases as a state and federal
prosecutor.
Prosecutors will also need to tread carefully since if the jury
finds Tsarnaev guilty and sentences him to death at the trial's end,
expected in June, both decisions likely would be immediately
appealed.
Particularly when questioning victims of the attack, prosecutors
will need to take care not to elicit testimony so emotional that it
would be found inflammatory by an appeals court, experts said.
"You can reach a tipping point where the appellate court will say
you've gone too far," said Epstein, of Widener University. "The
prosecution has to tell the terror and the violence of this case
without making it impossible for jurors to react in a rational way
when they reach sentencing."
(Reporting by Scott Malone; Editing by Diane Craft)
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