Questions about whether U.S. President Barack Obama should apologize over the alleged brutal murder of an Okinawa woman by an American base worker were raised Tuesday on the final day of the Citizens' Ise Shima Summit in Mie Prefecture.

Speaking on a global peace and security panel, former Lower House member Ryoichi Hattori of the Social Democratic Party said: "We have to think about how to revise the U.S. Status of Forces Agreement (to give Japan more legal authority). And a lot of attention will be on whether Obama will apologize to (Prime Minister Shinzo) Abe."

Kenneth Franklin Shinzato, a 32-year-old former U.S. Marine working at Kadena Air Base, has admitted murdering 20-year-old Rina Shimabukuro and dumping her body, according to police.