5 NFL players who were diagnosed with CTE after dying at a young age

#3 Colt Brennan

Colt Brennan had a legendary college football career in Hawaii, finishing in the top 10 in NCAA history in passing yards and touchdowns. He was then able to turn that into a professional football career that lasted seven years spread across the NFL, CFL, Arena Football League, and United Football League.

Brennan reportedly struggled with substance abuse for much of his life. He attempted to check himself into a drug and alcohol detox and rehab center in 2021 at just 37 years old, but he was turned away because they were filled to capacity. He tragically overdosed on drugs shortly afterwards and was diagnosed with CTE following his death.

#4 Demaryius Thomas

Demaryius Thomas spent the majority of his NFL career with the Denver Broncos, helping the team win a Super Bowl. He was once one of the most dominant wide receivers in the NFL, exceeding 90 receptions and 1,300 yards in four consecutive seasons.

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Thomas retired at 31 years old and passed away just two years later. He was found dead in his home after suffering a seizure, which was initially thought to be related to complications from a car accident he was involved in two years earlier. His autopsy later found that he had CTE.

#5 Aaron Hernandez

Aaron Hernandez was one of the best tight ends in the NFL during his short run with the New England Patriots. In less than three full seasons, he had combined for 210 receptions for 2,316 yards and 20 touchdowns. But off-field issues ended his NFL career and his life early.

Hernandez was involved in several legal issues and was charged with first-degree murder for his involvement in the death of Odin Lloyd. Hernandez was sentenced to life in prison, but committed suicide in his jail cell at just 27 years old. He was later diagnosed with advanced CTE.