Sealey scored both goals in West Ham's 2-0 win against against TSV 1860 Munich in the 1965 European Cup Winners' Cup final at Wembley Stadium. He had previously scored just three goals for the East London club that season, and was only in the line up replacing another player.
Sealey's top flight career virtually ended within a year of this. He was playing cricket with team-mates during a rest in pre-season training, and broke his leg while falling over a wooden bench. He ended his league career playing for Plymouth Argyle in 1967, but continued playing with non-league sides Romford and Bedford Town.
His family maintained its close connection to West Ham United, with his nephew, Les, and grand nephews signing for the team. He died in February 1996 from a heart attack, aged 53, just over five years before the same condition claimed the life of Les Sealey (aged 43).