King County sheriff's deputies say the 23-year-old victim was shot about 2:15 a.m. in the 200 block of Southwest 108th Street.
Residents were alerted by a person who went banging on doors in the neighborhood, yelling that someone had been shot. Someone also called 911 and reported hearing at least one gunshot and seeing a man down in the street.
When deputies arrived, they found the victim lying in the middle of the street, still barely clinging to life. They performed CPR, but the man died at the scene.
Witnesses said they saw two juveniles running away after the shooting. A police dog was unable to track them down, and King County sheriff's spokeswoman Cindi West said the pair's actual involvement "is unknown at this time."
The first juvenile is described as a black teenager, standing about 5-foot-6-inches, wearing a red sweatshirt and black pants.
The second juvenile is described as a black teen about 5-feet-8-inches in height, who was wearing a gray hoodie, sweatshirt and black pants.
The motive in the shooting is unclear, but Deputy Charlie Akers says the victim still had his wallet and cell phone, so it doesn't appear to be a robbery.
Anyone with information is asked to call the King County Sheriff's Office at 206-296-3311.