Darting and sprinting up the block, the little boy with the miniature football was as familiar a sight as the cabs that zoomed through Park Hill Avenue, the main artery of the Park Hill housing projects on Staten Island. Immaculately attired in charcoal gray slacks, a silk shirt and navy blue Buster Brown shoes, 4-year-old Gary Ham Jr. was playing with friends outside his apartment building on a humid summer morning in 1987. He was waiting for a church van to take his family to a Sunday service...