A 53-year-old man escalated an argument over an open window with Metro bus driver Shawn Yim, then pepper sprayed and kicked Yim before walking off into the early-morning darkness Wednesday in Seattle’s University District, according to King County prosecutors.
As Yim trailed Richard Sitzlack while speaking on the phone with a 911 dispatcher, Sitzlack doubled back and repeatedly stabbed Yim, 59, who collapsed in an empty parking lot, prosecutors say.
Yim, who was unarmed, died at the scene…