According to People, Redmond, who had been undergoing rehab for heroin addiction since September, was busted on a drug violation on December 29.
Judge Michael Tynan ordered the troubled star into a jail-rehabilitation clinic pending sentencing on February 2. "It seems to me you haven't got a clue as to what recovery means. It's a lifetime commitment. It's grinding, hard, painful work," he said.
Redmond explained his relapse in a letter, citing his recent family troubles and that "he had let them down". Fawcett died last June while her son was behind bars.
Despite this latest arrest, his lawyer is reportedly confident that his client will be released from jail.