BOSTON — Administrators and staff at a leading Boston hospital are mourning the death of a cardiac surgeon who was fatally shot at the hospital by a man who then killed himself.

Officials at Brigham and Women's Hospital said Dr. Michael J. Davidson, director of endovascular cardiac surgery, died late Tuesday after being shot around 11 a.m.

“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,” said a statement issued by the hospital, which is affiliated with Harvard Medical School. “It is truly devastating that his own life was taken in this horrible manner.”

Police said Stephen Pasceri, 55, entered the hospital Tuesday morning and specifically requested the doctor.

Pasceri, of Millbury, shot the doctor twice just outside an examination room on the second floor of the Carl J. and Ruth Shapiro Cardiovascular Center; he then turned the gun on himself, police said.

CINCINNATI — A highway where an overpass collapse during demolition work left one worker dead and a tractor-trailer driver injured was cleared of concrete and steel on Tuesday and reopened, but police were left wondering what the casualty toll might have been had the accident occurred amid heavy traffic.The removal of tons of debris from Interstate 75 began Tuesday afternoon and was completed by nighttime, allowing the closed southbound lanes to reopen to traffic. Minor repairs were made, the state Department of Transportation said.Casualties could have been much higher had the late-night collapse happened at a busy time on the interstate, which carries more than 178,000 vehicles a day.Authorities identified the worker who was killed as Brandon William Carl, of Augusta, Kentucky. The Hamilton County coroner's office will do an autopsy to determine the cause of his death.