Actress Michelle Trachtenberg has died, New York police confirmed Wednesday.

Trachtenberg was found unconscious and unresponsive in a Manhattan apartment at 8 a.m. Wednesday, police said. She was pronounced dead at the scene.

The death is not currently being investigated as suspicious, a police spokesperson said.

An official cause and manner of death will be determined following an autopsy by the medical examiner.

She was 39 years old.

Trachtenberg started acting as a child with small commercial and TV parts until she was cast as Nona F. Mecklenberg in Nickelodeon’s “The Adventures of Pete & Pete.” Her first major movie role came when she played the title character in “Harriet the Spy” in 1996.

Her fame grew throughout the 2000s with two major parts in ultra-popular TV shows: first Dawn Summers in “Buffy the Vampire Slayer” and then later Georgina Sparks in “Gossip Girl.”

Her most recent listed acting credit was a return to her “Gossip Girl” character with a guest appearance in the show’s HBO remake in 2022.

Rosie O’Donnell, who acted alongside Trachtenberg in “Harriet the Spy,” called the death “heartbreaking” in statement to People. “I loved her very much. She struggled the last few years. I wish I could have helped,” she said.