Sher Kung was riding her bike at Second Avenue and University Street when she was struck by a large box truck. She died at the scene.
By Friday evening, friends, colleagues and strangers had set up a memorial near the crash site to pay tribute to Kung.
Kung was a Seattle attorney and a former fellow for the Washington ACLU. She was part of the team that successfully represented Major Margaret Witt, who was dismissed by the US Air Force because of her sexual orientation.
That settlement and Kung's work on it helped pave the way for the overturning of "Don't Ask Don't Tell."
In a Friday statement, the Washington ACLU said, "The staff of the ACLU is deeply saddened by the news of her death. She was very committed to civil rights and social justice, and was a lively person and was fun to work with."
The tragic accident has many people calling for changes to the bike lanes in the area.
"This has been a bad corner for bicyclists for a long time. Probably like once a month we've seen someone get hit and knocked off their bikes, injured. This is the first time I've seen someone fatally hurt," said one man who works across the street from the where the accident happened.
The city is a few weeks away from implementing much-demanded safety changes for bicyclists on Second Avenue, which will include new signaling.
"It's really distressing that in two weeks this bike lane is supposed to be installed, and I think if it had been in place it could've prevented this from happening," a local cyclist said.
Instead, what has happened will not be easily overlooked by anyone passing by.
Police have not said if the driver who hit Kung will face any criminal charges. Witnesses at the scene said he was very distraught and immediately called 911.