Chicago marked its 500th homicide of the year early Sunday afternoon on a block of well-kept homes in West Pullman, where Perry Anderson was gunned down as he stepped from his mother’s house. Anderson’s father believes two gunmen were waiting for his 28-year-old son when he left the house in the 12400 block of South Harvard Avenue. “They shot him maybe nine or 15 times and never took anything from him,” Perry Anderson Sr. said. “My son never hurt nobody.”