C.J. DiPrima, 29, a cancer survivor completes his resolution to run the Boston Marathon with his team from the Mass General Cancer Center, including the doctor who treated him.

Boston Marathon bombing survivor Dave Fortier turned tragedy into purpose, returning to the race a decade later with the foundation he created to provide support to survivors of terror events.

Dozens of golden retrievers and their owners met at Boston Common in honor of the late beloved Boston Marathon dogs Spencer and Penny.

The city of Boston held memorials to honor the victims and survivors of the 2013 Boston Marathon bombing.

Ten years later, survivors of the Boston Marathon bombing attack recall the agony and the comeback as they work to help others through the trauma.

After recovering from severe injuries to her lower legs, 18-year-old Gillian Reny established the Stepping Strong Center for Trauma Innovation to fund new treatments for every kind of trauma.

Boston is marking the tenth anniversary of the Boston Marathon bombing with an emotional remembrance.

Security will be tight for this year's race, to be held on Monday, though the FBI says it's not aware of any specific threats.

An unsolved triple murder has been linked to one of the suspects in the 2013 Boston marathon bombing. A Hulu docuseries takes a deeper look at the investigation.

The three-part investigative series explores an unsolved triple-murder mystery that rocked a quiet Boston suburb in 2011 and its possible link to the infamous Boston Marathon bombing.

For Henry Richard, the brother of a Boston Marathon bombing victim, the journey to the finish line at this year's marathon was nearly a decade in the making. ABC News’ Will Ganss has his story.

The Supreme Court reinstated the death sentence for Boston Marathon bomber Dzhokhar Tsarnaev.

Reciting the gruesome details of the Boston Marathon bombing, a Justice Department lawyer asked the Supreme Court to reinstate the death sentence for Dzhokhar Tsarnaev.

The Justice Department is asking the Supreme Court to reinstate the death sentence for Boston Marathon bomber Dzhokhar Tsarnaev, despite a Biden moratorium.

"There was such a sigh of relief," Jacqui Webb said of seeing Casper after eight years. "Having Nichole again and having her understand my past, was extremely comforting."

Martin Richard was 8 years old when he was killed on April 15, 2013.

The teen received microprocessor knees to help him get back on his feet.