TMZ has now learned that the official cause of death listed on her death certificate is due to cirrhosis of the liver, which was brought on by alcohol abuse. She reportedly had been suffering from the disease for months but it became acute shortly before her death. The site says that gastrointestinal bleeding occurred shortly before her death which caused her heart to stop.

Pena was best known for her role in the 1987 film 'La Bamba' opposite Lou Diamond Phillips. She would later guest star on 'L.A. Law' and most recently, on 'Modern Family.' She also lent her voice to the 2004 Disney-Pixar film 'The Incredibles.'

We continue to send our thoughts to her family, friends and fans.

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