Schwarze Hochzeit
Terror Stalks the Class Reunion (original)
Starring Kate Nelligan, Jennifer Beals, Geraint Wyn Davies, Werner Stocker, Manfred Lehmann, Marga-Maria Werny, Horst Scheel, Madeleine Robinson, Gertrud Prey, Hans Irle
Watch "Schwarze Hochzeit" on Amazon Prime released in 1992. It's a crime and mystery movie, and has a rating of 5.7 out of 10 from Imdb which is fairly okay for this kind of movie.