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			 The same jury that on Wednesday found Tsarnaev, 21, guilty of 
			carrying out one of the most shocking attacks on U.S. soil since 
			Sept. 11, 2001, will hear from more prosecution and defense 
			witnesses before determining whether to sentence him to death or 
			life in prison without possibility of parole. 
			 
			The prosecution is expected to portray the ethnic Chechen as an 
			Islamic extremist adherent of al Qaeda who planted one of the two 
			homemade pressure cooker bombs at the race's finish line on April 
			15, 2013, because he "wanted to punish America for what it was doing 
			to his people," in the words of Assistant U.S. Attorney Aloke 
			Chakravarty. 
			 
			The defense, meanwhile, is expected to play up the role of his 
			26-year-old brother, Tamerlan, in carrying out the attack. In 
			closing arguments last week, defense attorney Judith Clarke 
			contended that Tamerlan was the driving force behind the bombing, 
			with Dzhokhar following along. 
			
			  Tamerlan died during the brothers' chaotic final day of freedom. 
			Three days after the bombing, the pair shot dead a police officer 
			and carjacked a Chinese businessman as they attempted to flee the 
			city. 
			 
			The carjacking victim escaped and alerted police to their plans, 
			setting the stage for a gunfight between the Tsarnaevs and law 
			enforcement that ended when Dzhokhar roared off in the stolen SUV, 
			running over his brother. During the guilt phase of the trial, 
			U.S. District Judge George O'Toole had limited the amount of 
			evidence the defense could present about the relationship between 
			the brothers, who had immigrated to the United States from Russia a 
			decade before the attack. 
			 
			
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			But the sentencing phase, which the Justice Department announced on 
			Friday would begin on April 21, will provide the defense with an 
			opportunity to focus on that element of the case and possibly to 
			call Tsarnaev to testify. 
			 
			The death penalty is controversial in Massachusetts, where it is 
			illegal under state law but allowed in federal cases. The state has 
			not seen an execution since 1947. 
			 
			The bombing killed restaurant manager Krystle Campbell, 29; Chinese 
			exchange student Lingzi Lu, 23; and 8-year-old Martin Richard. 
			Tsarnaev also was found guilty of the fatal shooting of 
			Massachusetts of Institute of Technology police officer Sean 
			Collier, 26. 
			 
			(Editing by Barbara Goldberg) 
			
			[© 2015 Thomson Reuters. All rights 
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