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Former NFL Player Saousoalii Siavii Jr., 43, found dead in federal prison

LEAVENWORTH, Kan. -- A former Kansas City Chiefs defensive tackle was found dead in a Kansas federal prison where he was being held on charges of illegal firearms possession, a prison official said.

Saousoalii Siavii Jr., 43, was found unresponsive at the U.S. Penitentiary in Leavenworth on Thursday afternoon, U.S. Bureau of Prisons spokeswoman Anna Armijo said in a statement, The Kansas City Star reported. Siavii was treated by prison staff and taken to an area hospital, where he was pronounced dead.

The prison did not release additional details about Siavii's death. An email sent to a BOP spokesperson from The Associated Press was not immediately returned Friday.