The King County sheriff's office identified the suspect Friday as Joseph D. Cooley. He is not in custody and officials told KOMO-TV they are working tirelessly to find and arrest him.
The shooting happened Wednesday in an apartment complex parking lot.
The victims called for help as they were driving to a hospital. They were met by deputies who rushed them to Harborview Medical Center in Seattle. The 17-year-old died.
Detectives said the shooting was not random or part of a gang conflict. They said it appears jealousy played a role in an argument that led to the shooting.
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