Isaiah Rider

Former NBA star Isaiah Rider had NO IDEA what he did to get himself arrested in Arizona this week -- and during his court appearance on Tuesday, he was trying to get some answers. As TMZ first reported, Rider was arrested and locked up on a no-bail hold in Maricopa County this week for violating…

Former NBA 1st round draft pick Isaiah "J.R." Rider was arrested in Arizona this week for violating his probation ... TMZ has learned. Rider -- who played in the NBA from 1993 to 2001 -- is currently behind bars in Maricopa County on a no-bail hold. It's unclear why police believe Rider violated…