Jackson brought the painful subject up during a confrontation with Manigault, who was her teammate on Sunday's episode of "Apprentice."
"Omarosa is the most evil person I have ever met. She's a no-good, conniving, scheming, cut-throat, probably pulled the cord on Michael Clarke Duncan," E! News quoted Jackson as saying.
Jackson also said Manigault probably caused Duncan's heart attack.
Show host and executive producer Donald Trump later fired Jackson after her team failed to create a successful 5-minute soap opera for Crystal Light, E! said.
Celebrities previous eliminated this season from the business-themed competition series this season are rockers Dee Snider and Bret Michaels.
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