A 42-year-old woman committedsuicide by jumping off a three-storey building in south Mumbai's Fort area, police said on Thursday.The incident came to light in the morning, when the woman was found lying in a pool of blood near Patel Building at Fort, an official said.The victim was rushed to a state-run hospital nearby, where she was declared dead before admission, he said.A case of accidental death was registered at Mata Ramabai Ambedkar Marg police station, he said, adding that further probe is underway.