Michelle Trachtenberg's death Wednesday left her former co-stars like Rosie O'Donnell, Melissa Gilbert and Kenan Thompson shocked and saddened.

Following the heartbreaking news that the “Buffy the Vampire Slayer” star died Wednesday at the age of 39, friends and former colleagues took to social media to honor the late actress.

Trachtenberg, a former child star who appeared went on to co-star “Buffy the Vampire Slayer” and “Gossip Girl," was found dead at her 51-story luxury ... horrible news.” Melissa Gilbert, who starred ...

Trachtenberg, who died on Wednesday at the age of 39, rose to fame at just 10 years old as the plucky titular snoop in the 1996 film “Harriet the Spy.” ...

He executive produced three telefilms that starred Dennehy as Chicago cop Jack Reed from 1992-94 and worked on other TV movies that starred Raquel Welch, Melissa Gilbert, Peter Horton and Lisa ...

Actor Gene Hackman, his wife Betsy Arakawa, and their dog found dead in their New Mexico home. Oscar-winning actor Gene Hackman, 95, was found dead in his New Mexico home alongside 64-year-old wife ...

Michelle Trachtenberg's co-stars and fellow celebrities are speaking out after the "Gossip Girl" and "Harriet the Spy" star was found dead Wednesday.

Michelle Trachtenberg, the actress known for her roles in Buffy the Vampire Slayer and Gossip Girl, has tragically passed away at 39. Friends and fellow stars mourn her loss as investigations into her ...

Blake Lively, Sarah Michelle Gellar and others who worked with Michelle Trachtenberg remembered the “loving” and “electric” actress, who was found dead in her NYC apartment ...

Trachtenberg starred in a number of children's movies before getting a breakout role as Dawn in "Buffy the Vampire Slayer." ...