At 2:49 p.m. on April 15, 2013, two explosions on Boylston Street forever changed the Boston Marathon -- and the people involved. Friends, family and fans paid tribute over the weekend to remember 29-year-old Krystle Campbell, 8-year-old Martin Richard, 23-year-old Lingzi Lu, 27-year-old MIT patrol officer Sean Collier, and the survivors.
Arredondo, who helped injured runners and spectators in 2013, leads the congregation in prayer during the special Mass for Boston runners. Jessica Rinaldi/The Boston Globe/Getty Images A runner kneels at the site of the Boston Marathon bombing on the five-year anniversary. Jessica Rinaldi/The Boston Globe/Getty Images Lingzi Lu's father, Jun Lu, and aunt Helen Zhao carry a wreath ahead of Martin Richard's family during a ceremony at the site of the second explosion. AP Photo/Michael Dwyer Massachusetts Gov. Charlie Baker stands alongside Patricia Campbell (blue jacket) at the site where her daughter, Krystle Campbell, was killed. Jessica Rinaldi/The Boston Globe/Getty Images Christopher Nzenwa of Boston prays at the site of the first explosion. AP Photo/Michael Dwyer Boston Marathon bombing survivors Patrick Downes and Jessica Kensky are introduced before a game between the Red Sox and Orioles on Friday at Fenway Park. Billie Weiss/Getty Images
Survivor Jeff Bauman (center) and Arredondo were also recognized during a Red Sox game. Adam Glanzman/Getty Images