Star that moved, then changed directions

At first I thought I was looking at a star (same size and white color as the other stars in the sky at that time), but then it started moving in a straight line. It wasn't a plane (only one light, and too small or far away to be one), so it had my curiosity. As I watched and it seemed to lose some brightness, all of a sudden it made a sharp left turn. Now I'm definitely interested. It now travelled on a straight line in its new direction. After watching for a few minutes, it seemed to get less and less bright, until I could see it no more. The entire time I viewed it was approximately ten minutes.