The father of 8-year-old bomb victim Martin Richard had tried to shield the eyes of the boy's brother, 12-year-old Henry, as the carnage unfolded around them. The explosion that killed his younger son, Martin, seriously wounded his wife and daughter.
Denise Richard, 43, suffered a severe head injury and Jane, 6, lost a leg, while cheering on the Boston marathon runners, after the second of two bombs exploded near the finish.
Yesterday Barack Obama visited the city and told a congregation of thousands in its cathedral "our hearts are broken" for the Richard family and for Martin, whose "last hours were as perfect as an 8-year-old boy could hope for - with his family, eating ice cream at a sporting event".
Paying tribute to his "big smile and bright eyes", Obama said Martin would be remembered not by the violence of the day, but by the pictures released this week of him enjoying a Boston Bruins ice hockey match and painting in a classroom.
"We're left with two enduring images of this little boy," Obama said. "Forever smiling for his beloved Bruins and forever expressing a wish he made on a blue poster board: 'No more hurting people. Peace'."