Today marks one year since the Boston Marathon bombing. In that time, federal prosecutors say they have collected a trove of evidence against suspect Dzhokhar Tsarnaev.

Boston Bombing 1 Year Later: What Went Wrong?

It’s believed that 29-year-old Krystle Campbell was killed by the second bomb that Tsarnaev is suspected of setting off.

Jeffrey Addicott, the director of the Center for Terrorism Law at St. Mary’s University, said guilt isn’t an issue in this case.

“[Tsarnaev’s] responsible for all three murders and the 260 people that were injured under the doctrine of conspiracy and the fact that he was working hand-in-hand with his brother,” Addicott said on America’s Newsroom.

Criminal defense attorney Juliane Balliro said the case comes down to whether he’s sentenced to life in prison or death.

She said, “Every phase of the case [the defense is] going to try to humanize him, make the jury believe that he has some redeeming values, some reason to save his life.”

They may also try to use a brainwashing defense to explain how he became radicalized.

“If he wants to use this trial as a platform for radical Islamist views, then he’s going to get the death penalty,” Balliro said. “And there’s nothing that this team can do, try as they might, to protect him from that."

More on the Boston Marathon bombing:

Boston Strong: Team MR8 to Run in Honor of 8-Year-Old Bombing Victim

Remembering Heroism: A Look Back at Boston Marathon Bomber's Capture

Rep. King Reacts to Report That Russia Withheld Info on Boston Bombers