The actor was reportedly found at a New York apartment with the cause of death as yet unknown

• Michelle Trachtenberg: a life in pictures

The actor Michelle Trachtenberg, known for Buffy the Vampire Slayer and Harriet the Spy, has died at the age of 39.

Police sources confirmed her death to both ABC News and the New York Post. There is no cause of death yet known and it has been reported that it is not being investigated as suspicious. She had recently undergone a liver transplant, according to sources.