The supernatural drama, which is in early stages of development, is described as The X-Files meets Buffy the Vampire Slayer, according to the site. The show would focus on a group of people who investigate paranormal occurrences.
Vampire Diaries' co-creator and executive producer Julie Plec may co-write with Williamson.
Williamson, 45, recently signed a deal with Warner Bros. Television, which produces The Vampire Diaries. The sophomore show is one of the CW's highest-rated shows. The most recent new episode attracted 3.4 million viewers and 1.6 rating in the 18-to-49 demographic on Nov. 11.