By Jesse Gissen

Former Diddy protégé, Trevell “G. Dep” Coleman, has been putting his time behind bars to good use. Complex has learned that the embattled Harlem MC is currently writing an autobiography; but this isn’t your typical, run of the mill hip-hop memoir, G. Dep— who’s been working on the book since his shocking murder confession landed him at Rikers Island Correctional Facility in late 2010—is writing his memoir entirely in rap form—the first time any music artist has attempted to do so.

Complex has obtained an exclusive first look of the book, titled Autobiographical Rapping Dude: The Rhyme Book, which we will exclusively premiere tomorrow.

The Autobiographical Rapping Dude follows The Deputy’s wild childhood years in the 1980s growing up on the dangerous streets of Harlem World to getting signed by Diddy in the late 1990s to his epic battle with PCP addiction and ultimately his controversial decision to turn himself in for a crime he committed nearly two decades ago.

Last week Coleman was sentenced to the mandatory minimum of 15 years to life in Manhattan Supreme Criminal Court for second-degree murder. On April 17, 2012 the 37-year-old rapper was found guilty of killing John Henkel in a botched robbery attempt outside of his residence, the James Weldon Johnson Houses, back in 1993. Coleman surprisingly confessed to the shooting some 17 years later at Manhattan’s 25th police precinct after he said it had been weighing heavily on his conscience.

Dep is most known for his 2001 hits “Special Delivery” and “Let’s Get It” off his Bad Boy debut Child of the Ghetto, released the same year. Two years later the troubled MC was dropped from the label and spiraled into a 15-year struggle with drug addiction that resulted in numerous arrests and brief stints in jail. He had tried to jump start his rap career on several occasions, but none proved successful.

Stay tuned for an exciting excerpt from G. Dep’s book exclusively on tomorrow.