I watched this movie a couple of years ago when it was aired quite a lot on TV.

There are two scenes I remember. The first one was a flashback showing a mother and her daughter on a terrace. The mother turned her little girl around and they were laughing. But suddenly you could hear a shot and the mother was lying on the floor. Blood flew out of her head.

The second scene I remember takes place a few years later when they investigate once more the case. They find a small cassette behind a heating on which the murder is recorded.

Any ideas what movie it was? It could be from the late 80ies or very early 90ies.