Leighton Meester is still processing the death of her Gossip Girl costar Michelle Trachtenberg. In an interview with Flaunt, the actress opened up for the first time since Trachtenberg died from diabetes complications at age 39 in February.

Leighton Meester is speaking out about her Gossip Girl co-star Michelle Trachtenberg’s death for the first time. Trachtenberg, who played Georgina Sparks on the hit drama, died in February at age 39 from complications of diabetes mellitus, the New York City Office of Chief Medical Examiner previously confirmed.

Michelle Trachtenberg’s sudden death left an empty hole in the hearts of fans and former costars whom she worked with throughout her acting career. Celebrities, including Michelle’s former costars Sarah Michelle Gellar and Blake Lively,