Less than 24 hours before she died, Lu Lingzi sent an exuberant email to a professor after learning she had passed part of a major final exam.

"I am so happy to get this result!" she wrote. "Thank you very much."

Lu was killed Monday during the Boston Marathon explosions, according to a statement from Boston University. She was a graduate student studying mathematics and statistics and scheduled to receive her graduate degree in 2017.

Lu was at the finish line of the race with two friends from BU. One, Danling Zhou, had surgeries Monday and Tuesday and is in stable condition at Boston Medical Center, the university's statement said. The other was unharmed.

On Monday morning, Lu put the finishing touches on a group research project she was planning to present at a statistics conference.

She also posted a photo of the breakfast ― bread chunks and fruit ― she ate the morning she died.

"My wonderful breakfast," she wrote.

Lu was a vivacious chatterbox who had lots of friends on campus, said Tasso Kaper, chair of the mathematics and statistics department, whose face lit up talking about his former student.

"The word bubbly ― that's kind of a corny word ― but that describes her very well," Kaper said.

Lu loved the springtime and kept asking when the trees would bloom in Boston.

"She was very interested in the flowers," he said. "Spring is a very important time of year for her."

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