Kristian Herzog Pens Tell-All Book on Oksana Grigorieva, Mel Gibson Saga

Oksana Grigorieva’s former bodyguard Kristian Herzog has completed a tell-all book about his former employer and her explosive relationship with Mel Gibson.

Herzog, who claims he nailed Oksana, but that she basically lied about all things Mel, is now hoping he can land a book deal, and is shopping around a draft.

The convicted criminal, who was once accused of impersonating a police officer, was set to be deposed by Mel this week but postponed that due to illness.

TEAM MEL: Kristian Herzog is ready to throw Oksana under the bus.

Kristian working with Oksana during a particularly turbulent time in her life - shortly after the January 6, 2010, incident in which she claims Mel attacked her.

"Kristian thinks there is a big market for a book, and he thinks he is the one that should spill the beans about Oksana and Mel's relationship," says a source.

“He is trying to do whatever he can to insert himself into this mess, and [Kristian Herzog] is adamant that he had an intimate relationship with Oksana."

Credible witness? Maybe not. Entertaining and enterprising? You know it!

Herzog was formally subpoenaed by Mel's legal team recently. Gibson, accused of domestic abuse, wants Herzog to admit Oksana exaggerated her claims.

When he is deposed, "Herzog can be expected to be grilled by both Oksana and Mel's lawyers. He has changed his story multiple times," the source says.

His motives are suspect. Herzog has an ax to grind with Oksana Grigorieva, insiders believe, because she fired him when she became aware of his past.

Basically ... who knows. But it should be interesting to watch unfold.