BOSTON—Dzhokhar A. Tsarnaev’s legal team openly admitted the defendant’s guilt in the April 2013 Boston Marathon Bombings during the first day of Tsarnaev’s trial Wednesday.

“It was him,” defense attorney Judy C. Clarke said at the John Joseph Moakley U.S. Courthouse in Boston.

Tsarnaev faces 30 charges from the April 2013 bombing, which killed three and injured over 260, as well as the subsequent manhunt and shooting of MIT Police Officer Sean Collier.

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In opening statements, Clarke, a public defender, painted her client as a victim of older brother Tamerlan Tsarnaev’s influences in an apparent attempt to sway the jury away from sentencing Dzhokhar Tsarnaev to death.

The trial currently is in the phase of determining Dzhokhar Tsarnaev’s guilt. If he is convicted, because 17 of his charges 30 charges are capital crimes, the jury of twelve will decide whether he will receive a death sentence.

“[Tamerlan] was determined not to be taken alive,” Clarke said of the manhunt and shootout. “Dzhokhar fled.” Tamerlan Tsarnaev was killed by a vehicle driven by his younger brother during a shootout in Watertown on April 19.

Sitting between lead defense attorney Miriam Conrad and Clarke and wearing a black blazer over a white dress shirt, Dzhokhar Tsarnaev appeared relaxed, at times conversing with his defenders.

Clarke, who has defended notorious murderers in the past, specializes in saving defendants from the death penalty.

The prosecution, led by assistant U.S. attorney William D. Weinreb, argued in its opening statement that Dzhokhar Tsarnaev was just as responsible as his older brother. He said that the two were “partners-in-crime,” planning and carrying out the acts together.

“Even though he and his brother played different roles in the crime, they are equally guilty,” Weinreb said.

The prosecution also repeatedly emphasized that the defendant digested terrorist literature and believed he was acting to retaliate against the United States for deaths of Muslims in the Middle East.

"He did it because he thought it would help secure him a place in paradise,” Weinreb said.

Weinreb was largely restrained, but at times painted a gruesome picture of the carnage the Tsarnaev brothers left in their wake. Weinreb emphasized that the bombs the Tsarnaev brothers placed near the finish line of the marathon were designed to “tear people apart and create a bloody spectacle.”

“The bomb tore large chunks of flesh out of Martin Richard’s body,” he said, referring to the eight-year-old Dorchester boy who died in the bombings. “Martin bled to death on the sidewalk as his mother looked on.”

Weinreb said that Dzhokhar Tsarnaev waited four minutes after he arrived at the explosion point before detonating the bomb, which he had left next to a row of children.

Weinreb claimed that in the days after the bombing, the defendant showed no remorse. 20 minutes after the bombs exploded, the Tsarnaev brothers drove to Whole Foods and purchased a gallon of milk, according to Weinreb. Also after the bombings, Dzhokhar Tsarnaev posted on Twitter that he was “a stress free kind of guy.”

“He acted like he had not a care in the world,” Weinreb said. “He acted that way because he believed that what he had done was good.”

The two sides disputed exactly how the younger Tsarnaev came to participate in the crimes. While the prosecution said that Dzhokhar Tsarnaev “self-educated” with terrorist materials he found online, the defense said that he was heavily influenced by his elder brother.

Clarke, one of Dzhokhar Tsarnaev’s lawyers, began her opening statement by addressing the emotional toll of the case. She referred to the crime as “misguided acts carried out by two brothers—26-year-old Tamerlan and his 19-year-old brother.” Throughout her defense, she argued that Tamerlan Tsarnaev led and planned the alleged attacks.

“[Dzhokhar’s] path was born by his brother, created by his brother, and paid for by his brother,” she said. “Unfortunately and tragically, Dzhokhar was drawn into his brother’s plan ... and that led him to Boylston Street.”

Members of the public and journalists watched the proceedings by television in two overflow courtrooms. Examinations of witnesses followed the opening statements.

Months before the bombing, Dzhokhar Tsarnaev worked as a lifeguard at Harvard’s Malkin Athletic Center. He attended the Cambridge Rindge and Latin School, just a few hundred feet away from Harvard’s campus.

—Staff writer Samuel E. Liu can be reached at samuel.liu@thecrimson.com. Follow him on Twitter @samuelliu96.