From the very article you posted, but apparently failed to read:

"The footage of Chubbuck's death has not been seen since its initial airing. Numerous theories on what happened to the footage have come to light. One is that the station owner Robert Nelson kept it, and it is in possession of his widowed wife, Molly. Another theory is that Chubbuck's family brought an injunction to prevent the release of the 2" quad videotape of her suicide, the Sarasota County Sheriff's Office seized the tape and released it to the Chubbucks, but her family states that they do not have it. There have been people who claimed to have seen it, but none have any proof."

>>14444008
It could be leaked, I've read it...