In the immediate aftermath of the explosions, a photographer snapped an image of a man with both legs missing being rushed to help in a wheelchair.
The man was Jeff Bauman and the picture went on to become an iconic image of the tragedy.
Now, Mr Bauman is engaged with a baby on the way, and as he told the Guardian in a comment piece recently, he holds no grudge over the photograph, and has since met the man who took it.
“[The photographer] was doing his job that day, and he was doing it well,” he wrote.
Carlos Arredondo, a spectator-turned paramedic, was one of the men who grabbed a wheelchair to rush Mr Bauman to help.
He would become the face of the many bystanders who stayed to help the victims of the bombings.
Mr Arrendondo and Mr Bauman remain friends, appearing together at numerous public events.
Former dance teacher Adrianne Haslet-Davis lost her left leg below the knee in the bombings.
Despite losing her foot, she vowed to dance again – and this year, she did.
Watch: Adrianne Haslet-Davis dances on stage
Ms Haslet-Davis performed on stage at a TEDx Conference with the help of a custom-built prosthetic leg.
The limb was developed by US professor Hugh Herr, himself a double amputee.
Survivor James Costello suffered horrific burns during the bombings, but while in hospital he would meet the love of his life.
Late last year, he announced his engagement to nurse Krista D’Agostino, whom he met while recovering at the Spaulding Rehabilitation Hospital.
With one leg amputated and the other still causing him pain, his recovery continues.
But only a few days after the anniversary of the bombings, Mr Fucarile will walk down the aisle to marry his fiancé. His seven-year-old son will be best man.
