Death Threats Over Big Brother Eviction

Sources close to Shelly tell us ... the reality star's family has received multiple phone calls from people threatening violence ... even making threats against Shelly's 8-year-old daughter.

We're told Shelly's employer has also been receiving harassing phone calls -- demanding the company fire Shelly immediately because of the way she voted on the show.

Sources tell us Shelly's family is preparing to get the FBI involved -- because they're taking the threats VERY seriously.