Jaynisha Scheffer, 19 was shot in the back and pronounced dead in the hospital. Police made no arrests for her murder.
That happened not long after the mayor joined community activists at an anti-violence vigil on the city's South Side to condemn all the weekend violence in chicago that again drew a national spotlight.
82 people were shot from Thursday afternoon to early Monday morning. 16 were killed. They include a 14 and a 16-year-old boy.
"It's a fair question, where were the police and what were they doing," said Mayor Rahm Emanuel at a vigil in the city's Roseland neighborhood. "I would also say where are the gun laws.. so you have comprehensive background checks."
Brown says he left the vigil to go visit with reformed gang members on the west side and wound up running for his life.
"I didn't feel any bullets flying past me, but I heard them," said Brown. "I had on a white shirt, so I'm the one that they followed.. and no police. Nowhere."
Brown is running for alderman in Chicago's 5th ward.