Fantasia Receives Death Threat

Fantasia Barrino is under a self-imposed lock down -- after the 'American Idol' champ received a threatening letter. It all started last night at the Pantages Theater in L.A. -- Fantasia was reading her fan mail after a performance of 'The Color Purple.'

Fantasia's manager tells us Barrino became alarmed over a disturbing letter loaded with racial slurs -- including the n-word -- and a line that read, 'go back where you came from and die.' We're told the person who wrote the letter claims he used to work as a security guard for Fox while Fantasia was on 'A.I.' Fantasia's manager tells us the singer immediately contacted theater security -- which then contacted the LAPD.

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