(CNN) -- They were standing near the finish line, cheering on the runners in the Boston Marathon. It was a beautiful, cool day when two bombs suddenly unleashed chaos and killed three people. As of Tuesday afternoon, identities of two of the three had been made public.
Friends of those killed say they are devastated by the senseless deaths.
Here is some of what we know about each of the victims who have been identified.
Krystle Campbell, 29, Arlington, Massachusetts
"She was the best," Campbell's distraught mother, Patty, told reporters Tuesday. "You couldn't ask for a better daughter."
The family is heart-broken and still in shock, Patty Campbell said as she tried to read a statement on the family's porch. Everyone loved Krystle, Patty Campbell said.
"She had a heart of gold. She was always smiling," the mother said, as her son, Billy, clutched his mother with his right arm.
Krystle's grandmother said the 29-year-old was a special kind of person who nurtured deep friendships.
"Oh, she was a beautiful girl," Lillian Campbell told CNN's Jake Tapper. "She was very happy, outgoing, a hard worker."
Lillian Campbell said her granddaughter even lived with her for a year and a half and was "great with me."
Her granddaughter was always willing to help someone in need, she said.
"And she was, she was just beautiful. She was a fun-loving girl," Campbell said.
Krystle Campbell once worked at Summer Shack, a seafood restaurant in the Boston area that posted a statement on its Facebook page saying she was beloved.
"She was an incredible woman, always full of energy and hard at work, but never too tired to share her love and a smile with everyone," the post said. "She was an inspiration to all of us. Please keep her and her family in your thoughts and prayers."
According to a story in the Boston Globe, Campbell had taken a job with Jimmy's Steer House in Arlington.
The Globe reported that Campbell often went to the see the marathon runners.
"She's been doing it since she was a little girl," Lillian Campbell told the newspaper. "She didn't miss a marathon, watching it at the finish line."
Campbell was a 2001 graduate of Medford High School, Medford Mayor Michael McGlynn said.
CNN affiliate WHDH reported that the Campbells are longtime residents of Medford and that Krystle was a very friendly woman.
Martin Richard, 8, Dorchester, Massachusetts
Martin Richard attended the Neighborhood House Charter School.
He "was a bright, energetic young boy who had big dreams and high hopes for his future," the school said in a statement. "We are heartbroken by this loss."
His father, William Richard, released a statement asking people to "continue to pray for my family as we remember Martin."
A neighbor, Jane Sherman, said that the Richard family is a "typical all-American family" and that Martin and his little brother always loved to play in their yard, no matter the weather.
Richard's mother and sister are recovering from serious wounds they suffered in the bombing, the father said.
Another life ended: A Boston University grad student
While the name of the third victim killed by the blasts was not yet public Tuesday, Boston University confirmed that the person was a graduate student at the school.
"The student was one of three friends who watched the race near the finish line," the university said in a statement posted on its website. "Another of the three students, also a BU grad student, was injured and is in stable condition at Boston Medical Center."
The third person in the group was unharmed, the statement added.
The school said the name of the victim was not released "pending permission to do so from the family."