By Tim Polzer
October 06, 2012

Ex-NFL running back Larry Johnson was arrested in Las Vegas. (Getty Images)

A police report obtained by TMZ alleged former Kansas City Chiefs running back Larry Johnson threatened a Las Vegas hotel security guard who responded to a domestic violence incident that led to Johnson's arrest this morning.

According to the report, the alleged victim identifies herself as Johnson's ex-girlfriend -- and told police LJ beat the c--- out of her and strangled her until she blacked out early Friday morning inside of a room at the Bellagio Hotel.

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