Rock Legend -- Sentenced to Jail After Heroin Bust

4/7/2011 8:30 AM PDT

Rock Legend -- Sentenced to Jail After Heroin Bust

Former "Social Distortion" drummer Casey Royer was sentenced to 90 days in jail yesterday ... TMZ has learned -- after the punk legend allegedly OD'd on heroin in front of his 12-year-old son.

Royer pled guilty in Orange County Superior Court to one count of being under the influence of a controlled substance. Prosecutors dismissed the child abuse and endangerment charge.

In addition to jail time, Royer -- who's currently released on bond -- was placed on formal probation for three years.

So far, a date hasn't been set for Royer to begin his sentence.

UPDATE: A rep for Royer released a statement saying, "Casey Royer, front man of the punk band DI has entered a rehab facility and is working in accordance with the courts wishes."