JAILED rocker PETE DOHERTY stares vacantly in his cell -- amid revelations he is shooting up heroin in the prison's DETOX unit.
The junkie singer, 29, has been injecting smack smuggled into London's tough Wormwood Scrubs slammer.
Doherty, jailed for snubbing rehab orders, is paying for the drugs by begging credit from fellow lags and writing IOUs.
A fellow inmate said: "We can't believe how much he's still clucking for it. They put him inside to force him to give up but Pete always has a need to feed his habit."
The heroin revelations came as The Sun obtained photos of Doherty behind bars, wearing prison-issue blue T-shirt and grey tracksuit bottoms.