The Zernik Murder Case
Leichensache Zernik (original)
After meeting the woman on the train Erwin Retzmann kills her in the forest.
Starring Kurt Böwe, Agnes Kraus, Rolf Hoppe, Lissy Tempelhof, Günter Naumann, Dieter Wien, Jürgen Holtz, Alexander Lang, Gert Gütschow, Norbert Christian
It's a crime and drama movie, and has a rating of 6.8 out of 10 from Imdb which is usually fine for this kind of movie.
Watch it here
Not found streaming from Singapore.