Ex-Mouseketeer Marque Lynche Drank Himself To Death

Marque Lynche ... the former 'All New Mickey Mouse Club' star died of "acute and chronic" alcoholism ... according to the NYC medical examiner.

The former co-star of Britney Spears and Ryan Gosling died back in December, and was found in his NYC apartment by his roommate.

Lynche -- who also shared the spotlight with Justin Timberlake and Christina Aguilera -- was a Mouseketeer from 1993 to 1995, and also appeared on season 3 of "American Idol."