Pulmonary fibrosis (PF) is a chronic lung disease where the tissue in the lungs becomes scarred and stiffens over time. Like all diseases, PF does not discriminate and there have been many celebrities who have suffered from the condition. Sadly, some have lost their lives to the disease.

According to Wikipedia, here are seven famous people who lost their fight with pulmonary fibrosis.

Sheila Matthews Allen
Sheila Matthews Allen was a Hollywood actress famous for roles in the films Poseidon Adventure and Towering Inferno and TV shows like Lost in Space and The Waltons. Allen passed away in November 2013 after a prolonged battle with pulmonary fibrosis. She was 84 years old.

MORE: Former Yankee Bernie Williams raising awareness for pulmonary fibrosis to honor his late father.