The cause of death for Michelle Trachtenberg, the “Gossip Girl” and “Buffy the Vampire Slayer” star, will remain undetermined as her family declined an autopsy, Variety has confirmed.

The Oscars in memoriam tribute, meant to honor names in film lost over the past year, skipped Michelle Trachtenberg and several others Sunday night.

Michelle Trachtenberg was close to closing a deal for a screenplay she had been working on for years before her shocking death last week, TMZ reports. Speaking to a director and producer involved with the project,

Michelle Trachtenberg, known for her roles in Gossip Girl and Harriet the Spy, was not only a gifted actress but also an accomplished writer.

Michelle Trachtenberg was reportedly working on a big project before her untimely death at age 39 Director Casey Tebo told TMZ on Monday, March 3, that Trachtenberg had written a screenplay based on the book Toy Monster: The Big,