St. Louis, MO (KTRS / AP) Authorities say a St. Louis police officer who was shot in the head while responding to a shooting on the city’s south side has died.

Twenty-nine-year-old Tamarris Bohannon had been with the department for nearly four years. A second officer who was shot in the leg Sunday was treated and released after the shooting in the South Grand neighborhood near Tower Grove Park.

The gunman barricaded himself inside a home and police negotiated with him for nearly 12 hours before the 43-year-old was taken into custody Sunday morning.

Mayor Lyda Krewson called the shooting a “terrible, senseless tragedy.”