Man convicted of killing cashier

At 10:30 p.m. on July 18, 2003, Jamel Heyward, 27, of 186 Amboy St. in Brooklyn, and Lueggie Dowling, 23, of 409 Beach 51st St. in Far Rockaway, entered Beautiful Gardens Chinese Restaurant at 21-03 Cornega Ave. where they robbed the store of about $500 a