EAST HARLEM (WABC) -- A community's hope to end gun violence echoed through East Harlem on Saturday.The plea comes after 16-year-old Juwan Tavarez was shot in the head last Friday afternoon . He later died at Harlem Hospital.The shooting happened outside the Jefferson Houses on Third Avenue right across the street from a middle school. Police say the incident started as an argument between the two groups at the housing complex.Community organizers are determined to see change - this as the search for a young man's killer is underway.Police are offering a $2,500 reward in the case. There are no suspects at this time.