I remember watching a movie a while back, probably 10 - 20 years ago. I would guess it was from the 80's maybe. All I remember is that it involved a sniper up high in a tower with a powerful sniper rifle and good scope. He was picking off random people, I think on a college campus maybe. I don't remember how it ended, but I believe they got him. Unfortunately that is all I remember. This is in English, likely US film.
The Deadly Tower.
From IMDb : Charles Whitman is student at the University of Texas in Austin. He often suffers from headaches, during which he tends to violence. One night, he kills wife and mother, buys a number of rifles and loads of ammunition and takes them to the top of the tower of the university, where he barricades himself. With his long-range weapons his starts to shoot at everything that moves. Already until the police arrives, there are numerous people wounded or dead.