Police aren't sure exactly what led up to the crash, but they say the man was in the intersection at 2nd Avenue West and Mercer Street when he was hit by a 2007 Kenworth dump truck.
The man was treated at the scene before being transported to Harborview Medical Center, where he died a short time later.
Police evaluated the 38-year-old truck driver for signs of drug or alcohol use and didn't find any impairment. The man wasn't cited at the scene, which police say is standard procedure in serious traffic collisions.
Traffic Collision Investigation Squad detectives are investigating.