Julie Vega (full name:Julie Pearl Apostol Postigo) was a very famous Filipino child actress, singer, and model. The cause of her death was rumored with a kind of Urban Legend. The reason is because she died abruptly as if there was no cause.
According to rumors, the cause of her death is the last horror movie she made. It was said she was cursed by some what a kind of engkantada when they created it in a province. The movie depicts her as a simple child daughter of a mortal woman and a demon (thus she is a half breed) and frequently being possessed by that demon.
Another rumor has it, a Spanish ghost was fond of her, that's why she (the ghost) took her innocent life. During the time when she was to be buried, a spirit-questor saw Julie Vega's soul floating over her coffin. She might be still alive at that time.
Source: http://philurbanlegends.blogspot.com