Schmezer was found dead in his hotel room in 's-Hertogenbosch, where three German riders are competing at the World Cup finals, the International Equestrian Federation said Friday.
"The loss of Holger Schmezer is a terrible blow to the German Dressage team, and to lose such an inspirational coach in an Olympic year is tragic," Princess Haya of Jordan, the federation president, said.
The federation said German riders Isabell Werth, Helen Langehanenberg and Nadine Capellmann wore black armbands in his honor Friday.
Langehanenberg, who placed second in the Grand Prix event, said the team discussed late into Thursday night whether it should compete.
Capellmann and Werth were gold medalists at the Beijing Olympics. They placed ninth and 10th on Friday. -- AP