Police say the officer happened upon the robbery at the Key Bank in the 26600 block of 72nd Ave NW just before 11 a.m.,
Details remain sketchy, but a foot chase ensued and went across the street to the nearby Haggen's grocery store. At some point, shots were fired and the robber was hit.
He was airlifted to Harborview Medical Center in Seattle where he was listed in critical condition and in the intensive care unit.
Officers have confirmed the robber had a gun on him during the robbery and they are still investigating whether the robber fired any shots. Neither the officer nor anyone in the bank were hurt.
Officials did say the officer had been in the area in a proactive role because of a recent string of nearby robberies. He is a 14-year veteran of the department and has been placed on administrative leave as standard procedure.