NFL star Tyrann Mathieu was threatened by a relative -- "I want 1.5 million by Friday or I am going to kill all you all" -- this according to federal court documents.
Officials claim 21-year-old Geourvon Keinell Sears tried to shake down the Kansas City Chiefs safety in April by threatening to contact TMZ with fake allegations of sexual misconduct if Tyrann didn't come up with the money.
For the record, we were never contacted by Sears.
At first, Sears' demand was $1.5 million -- but he later raised the number to $5 million, according to the documents filed in U.