This is very sad news, I never realised that he had cancer. Daum was a real character of a manager during his footballing managerial career.
Daum was a legend of a manager. Daum won the Bundesliga with VFB Stuttgart as their manager in the 1991/92 season, as Stuttgart finished the season top of the Bundesliga table, level on points with Dortmund, but with a superior goal-difference. Daum was also famous for managing Leverkusen in the late 90's, where they finished 2nd in the Bundesliga behind Bayern Munich on 3 different occasions, namely during the 1996/97, the 1998/99 and the 1999/2000 Bundesliga seasons. Leverkusen also finished 3rd in the Bundesliga under Daum during the 1997/98 season. Daum managed many clubs during career, both in the Bundesliga, as well as clubs in Europe. Daum even managed the Romanian national team from 2016 to 2017.
But as explained by others, Daum became infamously known for that cocaine scandal. However, the fact that he was a favourite to be Germany's manager in the year 2000, just demonstrates how highly rated as a manager he was.
R.I.P. Christoph Daum