Whenever we spoke, there was something medically wrong,” the pal said of the “Gossip Girl” star’s health “curveballs.”

More details about Michelle Trachtenberg's final days continue to emerge, with a former colleague sharing her plans before her tragic passing.

Michelle Trachtenberg was found in her New York City apartment, and the death is not believed to be suspicious, police said.

Michelle Trachtenberg's cause of death was ruled "undetermined" by the Office of Chief Medical Examiner in New York City, Fox News Digital confirmed.

Michelle Trachtenberg, born on Oct. 11, 1985, was a Manhattan-born actress who started her career on Nickelodeon at only three years old. Trachtenberg went on to make a name for herself in movies

Discover how Michelle Trachtenberg's words about Princess Eugenie have taken on a new meaning following the Gossip Girl star's tragic

Before her death at 39, Michelle Trachtenberg wrote a screenplay titled, 'Toy Monster.' Producer Casey Tebo exclusively tells PEOPLE that studio executives struggled to see the late actress for anything beyond her iconic television roles,

New York City native and "Gossip Girl" and "Buffy the Vampire Slayer" actress Michelle Trachtenberg has died at 39.

The creators and cast of “Gossip Girl” are paying tribute to actor Michelle Trachtenberg ... Police confirmed Trachtenberg’s death after responding to a 911 call in New York City.

Actress Michelle Trachtenberg has died at age 39. The beloved actress was found dead at her apartment in New York City on Wednesday, February 26. The New York Police Department confirmed to People that they responded to a 911 call at 1 Columbus Place around 8 a.m. on Wednesday morning.

Michelle Trachtenberg’s former “Buffy the Vampire Slayer” costar Sarah Michelle Gellar is looking back at their time together on screen and off, one day after Trachtenberg died in New York City.

Michelle Trachtenberg, the actor known for “Gossip Girl,” “Buffy the Vampire Slayer” and “Harriet the Spy” died Wednesday. She was 39.