Killer Karl Krupp

George Momberg retired to his adopted home in Atlantic Canada in 1988, working for Midland Trucking Company. He died in Moncton, New Brunswick after contracting hepatitis while wrestling in Japan.

In 1980, Krupp came to Memphis, where he eventually joined Jimmy Hart's First Family of Wrestling stable and tangled with Jerry Lawler. He returned before long, however, to Atlantic, Canada, where he had a memorable run in Atlantic Grand Prix Wrestling, holding the European Title and feuding with The Great Malumba and Hercules Cortez. In the mid-1980s, near the end of his career, he feuded with Angelo Mosca around southern Ontario. By the end of March 1983, he began wrestling in the Dallas Texas-based territory for his former All Japan Pro Wrestling tag partner, Fritz Von Erich's World Class Championship Wrestling.

On June 10, 1972, Krupp won his first of many assorted titles, defeating Leo Burke for the ESA's IW North American Heavyweight Championship. Early the next year he went to Japan, where he had many of his early successes, co-holding the NWA International Tag Team Championship twice between February and April 1973 (once with Johnny Valentine and once each with fellow 'evil Germans', Fritz von Erich and replacement partner Karl von Steiger). He also reached the final rounds of the 1974 and 1975 New Japan Pro-Wrestling World League Tournaments, both of which he lost to Antonio Inoki. Stateside, Krupp first became a big name in the Texas territory in 1973 before moving on to Portland in 1974 where he feuded with Dutch Savage. He also appeared in CWF Florida in 1975 and then moved on to Dick the Bruiser's WWA in Indiana. There as well as in Detroit, he used the moniker Baron von Krupp.

He made his debut as a professional wrestler in 1957 as Dutch Momberg and was not particularly memorable. Sometime around 1971, he changed his name to Mad Dog Momberg. In 1972, he finally hit upon the gimmick that would make him a star, the character of the 'evil German,' Killer Karl Krupp.

George Momberg (May 13, 1934 – August 24, 1995), better known by the ring name Killer Karl Krupp, was a Dutch-born professional wrestler famous during the 1970s and early 1980s.