India, Feb. 27 -- 'Gossip Girl' actor Michelle Trachtenberg died on Wednesday at the age of 39. Her mother found her unresponsive in her Manhattan apartment in the Central Park South neighborhood, NY Post reported. Police and EMS workers arrived and pronounced her dead. While the cause of death has not yet been confirmed, sources told the publication that they believe she may have died from natural causes. A source revealed that Trachtenberg had undergone a liver transplant last year, and there are concerns that her body may have rejected the organ.

"It is with great sadness to confirm that Michelle Trachtenberg has passed away. The family requests privacy for their loss," Trachtenberg's representative, Gary Mantoosh, said in a statement...