Career
He appeared in twelve senior matches, scoring nine goals for West Germany. In his spell with 1. Football Club Köln he set a record for the most goals scored by a player in a single Bundesliga match. On 17 August 1977, he contributed six goals (scoring in the 12th, 23rd, 32nd, 52nd, 73rd and in the 85th minute) to Köln"s 7–2 victory over Werder Bremen in front of a crowd of 19,000 at Köln"s Müngersdorfer Stadion.
But since the cameramen were on strike on this day, there are no television-recordings of Müller"s goals.
He was crowned Bundesliga topscorer that season (24 goals in 33 games), just like the season before (34 goals in 34 appearances). Overall he scored 177 goals in the West German top flight in 303 games.
He is the son of Heinz Kaster, who played as a defender for Football Club Saint Pauli and Kickers Offenbach in the early 1950s. He was struck by a family tragedy.
Müller suffered a severe heart attack on 5 October 2012 and fell into a five-day coma.