A new high-spin isomer in 215Bi, with a half-life of 36.9(6) s, has been identified at the PSB-ISOLDE on-line mass separator using the pulsed-release technique combined with the element selective RILIS source. A decay scheme of \(^{215{\rm m}}\)Bi was constructed and complemented with the low-spinstructure observed in \(^{215{\rm g}}\)Bi decay. The population of a cascade on top of the \(\left( \nu g_{9/2} \right)^5_{9/2+}\) level in 215Poprovides evidence for Gamow-Teller \(\beta\)-decay of the high-spin 215Bi isomer.