Shortly after the theatrical release of The Blair Witch Project, Oni Press published first a Blair Witch one shot and then a four-issue miniseries titled The Blair Witch Chronicles (all of which were later collected into a single trade paperback volume).
The same week that The Blair Witch Project got a wide release in 1999, the Sci-Fi Channel (now Syfy) aired the 45-minute documentary Curse of the Blair Witch.
That footage was ultimately released to the public in 1999 as the feature film The Blair Witch Project.
Conducted by Daniel Myrick and Eduardo Sánchez, it was considered for inclusion in the theatrical release of The Blair Witch Project.