Lu Lingzi identified as third Boston Marathon victim by Boston University

BOSTON -- A little boy cheering with his family. A young woman reveling in her favorite day. A student from a nearby university watching with friends.

Three people participating in an American tradition became part of American history -- spectators killed in the bombings at Monday's Boston Marathon.

Portraits of the three victims began to emerge as investigators tried to determine who was responsible for their deaths, and as friends, loved ones and strangers mourned their loss.

Up to 200 students, administrators and faculty at Boston University gathered Tuesday with candles in hand at Marsh Chapel -- next to a memorial dedicated to nonviolence advocate the Rev. Martin Luther King Jr. -- to pray and reflect as the college community learned of the student's death in the Boston Marathon bombings.

The university Wednesday identified the victim as Lu Lingzi, a graduate student in mathematics and statistics.

She was originally from China's northeastern city of Shenyang, a state-run Chinese newspaper reported Wednesday, according to The Associated Press.

Lu had been watching the race with two friends near the finish line, the university said.

One of the student's friends, also a grad student, was injured and remains in stable condition at Boston Medical Center, the university said. The third friend, another student, was not hurt.

BU spokesman Colin Riley said that the university scheduled the vigil to allow members of the community to console each other.

A second victim of the Boston Marathon bombings was identified Tuesday by her father.

Krystle Campbell, 29, of Medford, Mass., was killed as she watched the marathon with a friend, said William Campbell Jr., 56, by telephone.

"She was incredible," the heartbroken father said. "She was there for everyone, no matter what."

Campbell, a manager trainee at a steakhouse chain, was near the finish line to cheer for her friend's boyfriend when the bombs exploded, family said.

She was a regular spectator at the marathon.

"Ever since she was a little girl, it was her favorite day," her grandmother Lillian Campbell said.

Martin Richard, 8, of Boston's Dorchester neighborhood, also was identified by family as a victim of the bombings. Martin was remembered as a "sweet" boy with a bright smile and passion for soccer and baseball.

The bombs exploded as the boy and his family gathered near the finish line to cheer on friends running to raise money for charity.

William Campbell said he was "angry" at whoever perpetrated the attack.

Kelly Dunham, who identified herself as a neighbor and friend of Krystle Campbell, said "She will be forever missed. There was no one on Earth like Krystle. She was an angel on Earth."

With The Associated Press, Zachary R. Dowdy and Gary Dymski