NEW YORK (AP) — The death of an unarmed black man who was held in a police chokehold wasn't in vain, and could help change the relationship between police officers and the communities they patrol, Mayor Bill de Blasio said at a church service in honor of Eric Garner. De Blasio, who is white and is married to a black woman, spoke at the church the night of the grand jury decision not to indict the police officer. Coupled with police killings of unarmed black men elsewhere in recent months, Garner's death became a flashpoint in a national debate about relations between police and minority communities. The U.S.