Police are searching for the gunman, described as a man in his 30s wearing dark clothes.
Wednesday's shooting is the latest in a series of violent gun incidents in Seattle.
Last week a man was fatally shot by a stray bullet while he and his family drove down a Seattle street. Justin Ferrari, 43, a software developer, was killed when a stranger started shooting Thursday afternoon in Seattle's Central Area. Seattle police say the gunman's intended target was another person involved in a dispute with the gunman.
Ferrari's death was the second random killing in Seattle in about a month. In late April, a 21-year-old woman who recently moved to Seattle from Albuquerque, N.M., to pursue her dream of becoming a chef died of injuries suffered in an apparently random drive-by shooting near downtown. No arrests have been made in either incident.