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In this letter, the mesonic decay modes $\\mathrm{{^3_\\Lambda}H \\rightarrow ^3He + \\pi^-}$ and $\\mathrm{{^3_\\Lambda}H \\rightarrow d + p + \\pi^-}$ are used to reconstruct the hypertriton from Au+Au collision data collected by the STAR collaboration at RHIC. A minimum $\\chi^2$ estimation is used to determine the lifetime of $\\tau = 142^{+24}_{-21}\\,{\\rm (stat.)} {\\pm} 31\\,{\\rm (syst.)}$ ps. 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