A second victim in the Boston Marathon bombings has been identified: Krystle M. Campbell, a 29-year-old originally from Medford, Mass.

Her father, William A. Campbell Jr., told Yahoo News he's in shock that his daughter was killed.

"My daughter was the most lovable girl. She helped everybody, and I'm just so shocked right now. We're just devastated," he said. "She was a wonderful, wonderful girl. Always willing to lend a hand."

Campbell was at the finish line with a friend, Karen Rand, to cheer on her boyfriend, who was running the race. William Campbell said he doesn't know if Rand's boyfriend finished the race before the bombs went off.

Karen Rand survived, but was in surgery for her serious injuries through Monday night. Cheryl Rand Engelhardt, Karen Rand's sister-in-law, wrote on Facebook that Krystle's parents at first believed that Karen was their daughter, and that she had survived the attack, because Karen was carrying Krystle's ID. Krystle's family was finally ushered into Karen's hospital room after one of her leg surgeries by hospital staff, only to discover their daughter's friend instead of Krystle. Krystle was then declared missing, and the family found out on Tuesday she was among the dead.

More than 170 people were wounded—17 of them critically—and three were killed in the attacks, which occurred at 2:50 p.m. Monday near the finish line of the Boston Marathon.

Campbell attended the University of Massachusetts-Boston and Medford High School.

The other identified victim, 8-year-old Martin Richard, was running from the first explosion with his family when the second blast killed him. His mother and 6-year-old sister were injured in the bombing as well.

“My dear son Martin has died from injuries sustained in the attack on Boston," Bill Richard, Martin's father, said in a statement Tuesday. "I ask that you continue to pray for my family as we remember Martin. We also ask for your patience and for privacy as we work to simultaneously grieve and recover."

Late Wednesday, Boston University said one of its graduate students was among the dead, but did not release the student's name or any other identifying information, pending family notification.

Correction: An earlier version of this article said Campbell was cheering on her boyfriend, instead of Rand's boyfriend.