In March, Crum and Sparks informed Thornsbury that White was speaking with the FBI, prosecutors said. According to court documents, Crum and Sparks, together with Baisden approached White's brother, Glenn White, in March and advised that Thornsbury would give White a light sentence if he fired West and accepted another attorney approved by them.
West said he was dismissed by White the day the offer was made and the message relayed to his client.
"I was really upset with it because nobody likes to get hit across the face like that," West told ABC News.
White was appointed new legal counsel, after which Crum then directed a deputy to obtain a statement from White saying he had "never provided controlled substances" to him, according to prosecutors.
White is currently serving a sentence of one to 15 years on two counts of manufacturing or delivering narcotics.
Crum has since been shot and killed, in an unrelated incident in early April.
The family of Tennis Melvin Maynard, 37, accused of shooting Crum as he ate lunch in his parked car, have claimed the sheriff had molested Maynard when he was a teenager.
Ruby said that Baisden has already pleaded guilty to extortion charges.
Ruby would not comment on whether Sparks would be charged for his alleged role in the conspiracy, although he has confirmed Sparks' cooperation in the case against Thornsbury.
Thornsbury's legal counsel, Stephen Jory did not immediately respond to calls from ABC News.