Interest in carbon capture relevant to syngas based oxy-fuel combustion has inspired an extension of the high-resolution direct numerical simulation (DNS) to investigate the comprehensive nature of oxy-syngas combustion. The current research was motivated by two observations: (1) the local flame extinction of CO2-diluted oxy-syngas combustion has not been fully understood; (2) there is a lack of high resolution numerical data to gain new physical insights and to facilitate model development for oxy-fuel combustion. This work was aimed at clarifying the flame extinction characteristics of fundamentally important oxy-syngas turbulent nonpremixed flames using DNS and detailed chemistry with flamelet generated manifolds.