An employee of NHK who served as a commentator on the Sept. 11 terrorist attacks on the United States was found dead Monday in Tokyo after an apparent fall from a building, NHK said Wednesday.

Hiroshi Hasegawa, 55, was found on the ground near the NHK broadcasting center in Tokyo's Shibuya Ward on Monday morning and was pronounced dead soon after, according to the national public television network.

Police believe he fell to his death and are conducting an investigation, NHK said.

Hasegawa joined NHK in 1971 and became a commentator in 1997 after working in the network's political affairs section and serving as manager of its Bangkok bureau.

He had served as a senior commentator since 1998 and appeared Oct. 10 on a special program on the terrorist attacks, according to NHK.