In the beginning of this American movie/episode we get to watch a home video of a young girl having a picnic with her family in the park. I'm not sure, but I think they were flying a kite. Suddenly the girl runs away into the woods.
Many years later it is revealed that the girl has disappeared. Her much younger sister tries to figure out what happened. The younger sister is played by the same actress as the older one. The younger sister befriends a policeman or detective who is helping her with the case. One day on her birthday when they are out for a walk she asks him for a birthday kiss, but I think he brushes her aside. A red dress the older sister once was wearing is found and put on a display dummy at the police station.
The movie ends with us finding out that it was her father who killed her. I think she was about to run away with a boyfriend and then the father got really angry so he hit her in the head with a frying pan. He later buried her in the back yard. This is really all I can remember. It was a very long time ago since I watched it (I’m not sure if it was a movie or just an episode from a tv-show), not later than 2007.
I apologize for my bad English, haha!