His daughter Karin died in 2010 of cancer.
Only German actor, who has fan clubs in Europe as well as overseas. Even Pope John Paul II liked to watch him on Derrick (1974).
In April 2013 information emerged that actor Horst Tappert served as a member of the notorious Waffen-SS during World War II and hid the fact for years. Re-runs of "Derrick" were suspended in Germany and some other countries as a result. He never personally disclosed his connection with the SS.
Received Germany's Cross of Merit in 1988.
Lived in Gräfelfing near Munich with his third wife Ursula and is the father of three children from two prior marriages: Karin, Ralph and Gary (died 2001).