Between 1819 and 1824, Turner returned to sea in the schooner "Nonsuch" attached to a squadron commanded again by Oliver Hazard Perry. In addition to hunting West Indian pirates, his ship sailed up the Orinoco River to carry Perry on a diplomatic mission to the Venezuelan government under Simon Bolivar. During the return downriver, Perry and many of the crew contracted yellow fever. Turner was close at hand when his mentor died at Trinidad on 23 August 1819. During the remaining years of Turner's assignment to "Nonsuch", his ship worked along the east coast of the United States, patrolled in the West Indies to suppress piracy, and made a brief cruise to the Mediterranean in 1824.