The name of this movie, anyone?

In it, a woman is looking through a chain-link fence at a woman playing with a child, and the sun is shown beating down, and suddenly, the woman [who is looking through the fence] begins groaning in pain, turns red, and bursts into pieces. It's weird, I saw that part of it when I was about 6 yrs. old and I thought it was an 'Omen' movie but I have no idea. If anyone knows, that'd be great!