OAKLAND -- A two-hour public memorial service to honor slain U.S. Ambassador Christopher Stevens is scheduled for 4:15 p.m. Tuesday at San Francisco's City Hall. The memorial service will be followed by a two hour reception.

The 52-year old Stevens was killed in the Libyan port city of Benghazi in a terror attack on Sept. 11. Stevens was a Piedmont native, graduated from UC Berkeley, attended law school at UC Hastings and went on to become a career Foreign Service officer.

Former colleagues recalled his work throughout the tumult of the Arab Spring as particularly noteworthy and said Stevens would be remembered for his skill as a diplomat and his personal charm and affability.

Some 700 people, including former colleagues from the State Department, and friends and family from around the country, are expected to attend. A string sextet and a soprano singer will perform during the service, and Stevens' brother and sister are also expected to speak.

The closest parking is located at the Civic Center Parking Lot. BART riders should disembark at Civic Center station. The memorial service and reception are free and open to the public.