Yes, this is a species of Tegenaria. There are at least three species in your area, two of which are introduced, including the infamous "hobo" spider. There is relatively general agreement that the hobo is NOT venomous, but also little doubt that something is going on whereby its bites are sometimes causing necrotic wounds. This may be due to a bacterium the spider harbors on its fangs, but the mystery is still unsolved....Be careful not to put your hands where you can't see.

Thank you. I guess I should have kept the spider instead of releasing it. If it's a hobo, I really don't want it hiding in my gardening tool basket.

Thanks for the warning.

Thank you. That one looks almost identical. And King County is just south of here. That's probably it.