One of Michelle Trachtenberg's neighbors, Ariana Rodriguez, said she noticed the actress had become 'svelte' and looked 'less and less like herself in the last few months'

The cause and manner of Michelle Trachtenberg's death will remain undetermined, according to the New York City Office of the Chief Medical Examiner.

The cause of death for actress Michelle Trachtenberg has been ruled “undetermined” by the New York City Medical Examiner, according to an agency spokesperson.