Rapper DMX is serving time in the valley and we're now learning that he may spend a lot more time behind bars!

DMX, also known as Earl Simmons, may be charged with felony aggravated assault.

He's serving a 90 day sentence for several charges and was placed in lock down earlier this month.

FOX 10 has learned that while in lock down, Simmons apparently assaulted a Sheriff's detention officer.

If convicted of these new charges, his probation could be revoked and he could be sentenced to 8 years in prison

Source:  FOX News