Hundreds of mourners gathered in Wellesley on Friday for the funeral of Dr. Michael Davidson, who was shot and killed Tuesday morning by a former patient’s son.

Davidson, director of endovascular cardiac surgery at Brigham and Women’s Hospital in Boston and an assistant professor at Harvard Medical School, was a well-respected member of both the hospital and his neighborhood communities, according to colleagues and neighbors.

Dr. Davidson was a wonderful and inspiring cardiac surgeon who devoted his career to saving lives and improving the quality of life of every patient he cared for, the hospital said in a statement announcing Davidson’s death on Tuesday. It is truly devastating that his own life was taken in this horrible manner.

The shooter, 55-year-old Stephen Pasceri of Millbury, Mass entered the hospital Tuesday morning looking for Davidson. According to police, Pasceri shot Davidson twice outside an examination room before turning the gun on himself. Pasceri died on the scene from his self-inflicted gunshot wounds, and Davidson succumbed to his injuries several hours later, according to a tweet posted by the Boston Police Department.

Pasceri’s sister Marguerite Joly told the Boston Herald that Davidson performed heart surgery on their mother, who died in November.

“I think it comes down to the fact that my brother thought it was the doctor’s fault that my mother died,” Joly told the Herald. “I don’t know why my brother would blame him. I really don’t know why.”

According to ABC news, Davidson and his wife, Terri Halperin, have three children between the ages of nine and two. Halperin, also a physician, is currently seven months pregnant with the couple’s fourth child.

Several colleagues and family members spoke at Davidson’s funeral, which was held at Wellesley’s Temple Beth Elohim. Both of Davidson’s parents spoke to the crowd of mourners, as did Halperin.

According to WBUR, Susan Davidson poignantly referenced her son’s profession, stating, “My heart is broken, and only Michael can fix it.”

Halperin expressed shock toward the circumstances of her husband’s death, noting his cheerful and friendly behavior with patients.

“Surgeons are not known for their bedside manner, but Michael had it in spades,” Halperin said at the funeral, according to WBUR. “That’s why the fact that a patient’s family member would take Michael away from us makes it all the more devastating.”