Human rights activists led an 18-hour protest Thursday outside New York City Hall as they continue to demand officials shut down the Rikers Island jail complex. The demonstration was in response to the death this week of 26-year-old Gilberto Garcia, the 18th person to die at Rikers so far this year. Garcia had been jailed at Rikers for three years as he awaited trial. He died of an apparent drug overdose, but a cause of death has not been confirmed.