A movie

[Telecolor 3007]

When I was youger it was a movie at tv. But, unfourtnely, I dind't remeber it's name.
The only things that I could rember about that movie is that it was quyte old (I think it was from the '70's) and the ending: to young (white) boys, about 20-25 yrs old where runing into a garen, an one of them was holding an urn in his hand. One of it said to burry the urn (whic contained the ash of an former she-friend of them) near the palce where the swiming-poll was once, but the other replayed that isn't fine to do so, because there is the place where she killed hereself.
Can you please help me!