Boston University School of Management junior Andrew Lawrence died early Friday morning in his off-campus apartment of unknown causes. He was 20.

The youngest in a family of seven, Lawrence was raised in West Chester, Pa. by his parents, Patrick and Diane, along with four older sisters: Kimberly, 38; Jacqueline, 35; Kelly, 31; and Stephanie, 22.

“He was also the only boy and like a baby to my older sisters,” Stephanie Lawrence said. “Growing up with all of us, he was really good with women. My mother adored him and to my father, he was his only son.

“Also, he was very in love with his girlfriend,” she said of College of Arts and Sciences sophomore Ida Teberian. “They’d been dating since high school.”

As part of his junior-year core curriculum, Lawrence worked with a team advisor, professor Vincent Onyemah, and seven SMG juniors to produce, finance and market a product. The team created a baby care product with heating and massaging straps.

“Much of his life was between Ida and the team,” Onyemah said, adding the group often ate meals together.

Despite the rigor and stress of the course, his team members said Lawrence always maintained composure and focus.

“When everything was falling, he wouldn’t move,” Onyemah said.

“When we were really stressed out, he broke the ice,” team member Daniel Buettner added. “When he spoke, he had the floor.”

Onyemah recalled a day when he held class at his house because he was recovering from a knee injury.

“Andrew was one of four who actually came,” Onyemah said. “The only thing that he said was ‘Vini, what do you need?’ He had a big heart and was able to give without making noise.

“To him, everybody matters regardless of your race, how you are, where you belong,” Onyemah continued. “To Andrew, you are a human being.”

Team member Ainura Yeraliyeva said Lawrence often “picked up books, opened doors and gave up his chair” for people.

“One time we were walking and he said to me, ‘I really respect you because I don’t understand how you are able to live in a different culture and study a different language,'” she said. “That is how he was. I’ll remember that day forever.”

Many of Lawrence’s friends knew him for his laid-back manner and subtle wisdom, according to CAS junior Steve Ettinger, who said he rarely went a day without seeing Lawrence since they met during their freshman year.

“He was polite, honest, positive and just a good person in every sense,” he said. “He had this calming, beautiful wisdom about him that I’ve never seen in anybody before.”

In a hectic household, his family said Lawrence remained strong and stable even in the most overwhelming times.

“He found a way of finding simplicity in things, of tearing out nonsense to find the skeleton of it,” Stephanie Lawrence said.

She described the first time she and her brother tried travel packs of Apple Jacks and Cocoa Crispy cereal.

“We didn’t like it at all,” she said. “But my older sister was teaching us a lesson and told us we couldn’t get up until we finished. So Andrew sat there and ate his Apple Jacks, while I was more stubborn and refused. So he took mine and ate it.”

Lawrence was the captain of his Malvern Preparatory School soccer team and played intramural games throughout college. As a teenager, he taught himself to play the guitar.

“We’d come home and he’d be playing at 11 a.m. and driving us crazy,” Stephanie Lawrence said, adding that Bob Marley and Sublime were two of Andrew’s favorite artists.

During his summers, Lawrence worked for his local township on landscape projects, planting trees and paving roads.

Lawrence’s team members said he was majoring in management and entrepreneurship, but was particularly skilled at marketing.

“He was so smart and he was good at so many things,” Stephanie Lawrence said. “I never think he really figured out what to do with his life, but I know he had big dreams.”

Plans for a memorial service have not been announced.