Lil’ Kim’s ex-boyfriend — awaiting trial for six New York murders — has been moved to a secure prison cell to prevent violent attacks on guards as his mental state deteriorates, officials said yesterday.

Damion Hardy, once a member of Brooklyn’s notorious “Cash Money Boys” gang, is now housed in a special cell constructed so he can’t reach through the food-tray slot to attack passing officers, officials told a Brooklyn federal judge.

Hardy, 37, has been known to stick his arms through open food slots to stab and cut guards with makeshift prison “shanks” and to throw human waste on them, prosecutor James Loonam said.