 Dayley was traded along with Mike Jorgensen to the St. Louis Cardinals on June 15, 1984, for Ken Oberkfell.After spending most of the rest of that season in the minor leagues, he made it to the majors to stay in 1985, where he was converted to being a full-time relief pitcher.That would remain his role for the remainder of his MLB career, as he never started another game in the majors.