By Debbie Emery - Breaking Celebrity News Reporter

The depth of Joran van der Sloot's devious manipulative personality has been revealed first-hand in a letter written to the woman who has been paying his legal bills, Breaking Celebrity News can exclusively reveal.

In the handwritten mail, sent from Castro Castro prison in Lima, Peru to Mary Hamer of Lake City, Florida, the convicted killer begs her not to take any actions until he has found a way to call her.

EXCLUSIVE DOCUMENTS: Read Joran Van Der Sloot's Handwritten Letters To His 'Guardian Angel'

"I hope you keep supporting me," wrote van der Sloot, in the letter obtained exclusively by Breaking Celebrity News. "If everything goes according to plan I will be able to contact you soon."

The letter was sent after the 24-year-old Dutchman pleaded guilty and was sentenced to 28 years in jail for the May 2010 murder of Peruvian student Stephany Flores.

The 'Personal Story' Of A Killer, Handwritten By Joran Van Der Sloot

It appears to be a desperate plea by van der Sloot made after he learned that Hamer, who calls herself his guardian angel, had asked for $75,000 that she sent to his lawyer, Jose Luis Jimenez, to be refunded to her.

As Breaking Celebrity News exclusively revealed, Hamer claims that Jimenez ripped her off by saying it was for Joran's bail. "Now I find out by Peruvian law that there is no bail in Peru for murder," she said.