Frank Chamberlin Dead -- NFL Linebacker Dies from Rare Form of Brain Cancer

Frank Chamberlin – an NFL linebacker who played for three teams in his career – died from a rare form of brain cancer on Sunday … after battling the disease for over a year.

Chamberlin – who played most recently for the Texans -- was diagnosed with a deadly form of brain cancer (an anaplastic astrocytoma) in 2012 … after suffering a seizure at the financial firm where he was VP of equity sales.

The 35-year-old immediately underwent brain surgery … but doctors were only able to partially remove the tumor.

Chamberlin was a four year letterman at Boston College, where he played linebacker and fullback … and was drafted in the fifth round of the 2000 draft by the Tennessee Titans.

He played 57 games in his 5 year career … playing for the Titans (’00-’02), the Cincinnati Bengals (’03), and the Houston Texans (’05).

Chamberlin – who was living in NJ – is survived by his wife and three daughters.