After graduating from the University of Utah in 1967, Trumpy was selected by the Bengals in the 12th round (301st overall) of the 1968 Common Draft. Despite his low draft selection, Trumpy worked hard in the offseason and managed to earn the starting tight end spot in the team's lineup. He didn't disappoint in his rookie season, recording 37 receptions for 639 yards and 3 touchdowns, and earning a place on the AFL Western Division All-Star team. In 1969, Trumpy was selected by The Sporting News as the AFL's All-League tight end.