NEW YORK (AP) — A New York City jury is being asked to decide the fate of a reputed mob boss accused in six gangland slayings.The jurors heard closing arguments Tuesday at the Brooklyn trial of Thomas "Tommy Guns" Gioeli (Jee-OH'-lee). They could begin deliberations later in the afternoon.Prosecutors allege a police officer was among the six victims killed during the 1990s on orders from Gioeli.A recent crop of mob turncoats pleaded guilty and agreed to testify against the former reputed boss of the Colombo crime family.In summations on Tuesday, defense attorneys tried to portray cooperators as self-serving liars.