Brigham and Women’s Hospital lowered its flag on Wednesday, one day after the shooting death of Dr. Michael Davidson.

A woman placed a rose on top of a makeshift memorial outside of the hospital.

Mourners gathered outside the hospital.

Officials gathered outside the Carl J. and Ruth Shapiro Cardiovascular Center after the shooting Tuesday.

Police investigated the scene. A doctor who was shot later died of his injuries.

Davidson, a cardiovascular surgeon at the hospital and assistant professor at Harvard Medical School, died after hours of surgery.

Some hospital personnel were escourted out of Shapiro building after the shooting.

Boston Police Superintendent-in-Chief William Gross ( far right) and Boston Police Commissioner William Evans (center) investigated the scene of the shooting on the second floor of the Shapiro Cardiovascular Center.

The streets around the Shapiro Center were cordoned off with yellow police tape shortly before noon. Officials said Stephen Pasceri, 55, of Millbury, was the suspect who shot the doctor and then himself.

Boston Police detectives gathered outside the Shapiro building.

The incident trapped staff, patients and family members inside the building – sometimes in exam rooms – for about 45 minutes, witnesses said.

A man in wheelchair was taken away from the building where the shooting occurred.

Medical personnel walked past law enforcement officials outside the Shapiro Center.

Boston Police Commissioner William Evans addressed reporters during a news conference.

President of Brigham and Women's Hospital, Elizabeth Nabel, spoke to reporters at a news conference.

There was a heavy police presence in the Longwood Medical Area after the shooting.

Two ambulances and about a half-dozen police cars were parked in front of the building.