The CW announced last fall that the network was developing a new supernatural pilot similar to The Vampire Diaries. Secret Circle is based on a book series by L.J. Smith, who is also the author of the Vampire Diaries novels.
Williamson signed on to work on the script for Secret Circle in February. He will executive produce the series as well. However, Williamson has now revealed that he will focus principally on The Vampire Diaries, according to The Hollywood Reporter.
"My biggest fear is I don't want to be split between the two shows and I don't want to water myself down and hurt either," said Williamson.
He continued: "I'm not going to step away from my vampires. I'm too invested at this point; it's too much of a family for me to walk away from, but there's room in our day for me to help guide The Secret Circle along the way."
The Vampire Diaries airs Thursdays at 8pm on The CW.