10:26 PM: Just getting word of a deadly motorcycle crash that Seattle Police say has closed northbound 99/Viaduct. Via Twitter, SPD says the motorcyclist “went off the Viaduct and landed on Railroad Avenue.” A section of 1st Avenue South is also closed. Looks like this is by CenturyLink Field. The Traffic Collision Investigation Squad is arriving at the scene, which suggests this will be closed for some hours as they work to find out how it happened.
2:30 AM: WSDOT has sent an e-mail alert saying northbound 99 is now open again. No update from investigators yet, but one is likely in the hours ahead.
8:55 AM: Here’s the short update on SPD Blotter, saying the rider was ejected off his Triumph motorcycle after hitting the east guardrail, adding: “Speed may have been a factor in this collision.”
THURSDAY, 10:09 PM: The Medical Examiner identifies the rider as 30-year-old Nathaniel Hammer.