The man - who was held at gunpoint by the robbers who stole jewels worth millions from Kim in Paris last weekend- penned a message to the star in French magazine closer, TMZ reports.
He allegedly wrote: "Dear Kim: When you feel the cold steel of a gun at your neck, it is the moment when remaining calm can mean the difference of life or death, both our lives. I hope you are feeling better."
Meanwhile, it has been claimed that Kim is looking for a body double after her terrible ordeal in which five armed, masked men stormed into her room and tied her up with plastic handcuffs and duct tape.
Now, the 35-year-old beauty is on the lookout for a body double to help confuse any would-be assailants.
A source told the New York Post newspaper: "There's a circus that follows Kim's every move. Her new security team is recommending she employ a body double to help confuse would-be assailants."
But Kim has other worries on her mind, as another source claims she is most concerned about the possibility of her two children, daughter North, three, and 10-month-old Saint, being "kidnapped".
The source said: "The kids being kidnapped is Kim's biggest fear. She previously didn't want to shell out for armed security, but now she believes the family needs 24-hour protection."
And for Kim - who is married to music mogul Kanye West - the problems don't stop there, as she is also finding it difficult to know who to trust, amid speculation that the robbery may have been an inside job.
A third source told the publication: "She doesn't know who she can trust. Kim's team is conducting an internal investigation -interviewing assistants and looking through phones for evidence that anyone may have communicated with the thieves. They are slowly ruling people out."