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Red supergiants have been confirmed as the progenitor stars of the majorityof hydrogen-rich type II supernovae. However, while such stars are observedwith masses >25M$_\odot$, detections of >18M$_\odot$ progenitors remainelusive. Red supergiants are also expected to form at all metallicities, butdiscoveries of explosions from low-metallicity progenitors are scarce. Here, wereport observations of the type II supernova, SN 2015bs, for which we infer aprogenitor metallicity of $\leq$0.1Z$_\odot$ from comparison tophotospheric-phase spectral models, and a Zero Age Main-Sequence mass of17-25M$_\odot$ through comparison to nebular-phase spectral models. SN 2015bsdisplays a normal 'plateau' light-curve morphology, and typical spectralproperties, implying a red supergiant progenitor. This is the first example ofsuch a high mass progenitor for a 'normal' type II supernova, suggesting a linkbetween high mass red supergiant explosions and low-metallicity progenitors.

The lowest metallicity type II supernova from the highest mass red-supergiant progenitor