Ditterich, known as the "Blonde Bombshell", made an impressive debut as a 17-year-old for St Kilda against Melbourne in the opening round of the 1963 VFL season, with his speed, high leaping and endurance noted.[1][2]
He became a tough ruckman and often appeared at the VFL Tribunal, in particular missing St Kilda's only premiership victory in 1966 through suspension.[3]
In 1973, he transferred to Melbourne under the VFL's short-lived "10-year rule",[4] which allowed players with ten years' service at one club to move to another club without a clearance,[5] before returning to St Kilda in 1976, due to his six-year deal being too expensive for Melbourne to continue.[6]
In 1979 he switched again to Melbourne to become their captain-coach for two years;[7] during this period, the Demons suffered the worst defeat in VFL/AFL history, losing to Fitzroy by 190 points in Round 17, 1979.[8]
^The 10-year rule was introduced by the VFL in August 1972, in order to render it immune from the sorts of "restraint of trade" difficulties that were being experienced, at the time, in New South Wales in relation to Rugby League footballers. Although twenty-two VFL players were eligible under the rule, only George Bisset, Barry Davis, Ditterich, John Rantall, Adrian Gallagher, and Doug Wade, took advantage of it — transferring to Collingwood, North Melbourne, Melbourne, North Melbourne, Footscray, and North Melbourne (respectively). The rule was rescinded in May 1973.