This editor had been hearing rumblings that Quan Chu, the elderly man who died on Tuesday after he was struck by a bicyclist in an alley near the Convention Center in late November, was a figure many were familiar with. According to some who live in the neighborhood, Chu had been a fixture for years on the streets of Chinatown who — along with his wife — was one of the few remaining fixtures remaining from the era before Chinatown developed into the entertainment district it is today.