Aldon Smith has just been ordered to spend the next 12 months in jail ... TMZ Sports has learned.
The former NFL star was sentenced Friday inside a Northern California courtroom ... after he pleaded no contest to a felony DUI charge stemming from a 2021 incident in Redwood City.
Prosecutors tell us the ex-Dallas Cowboys pass rusher was remanded into custody after the hearing ... and will begin his year-long sentence right away.
Smith was also given five years of supervised probation, prosecutors say.
The 33-year-old football player, who was last with the Seahawks prior to the '21 season, was initially arrested in the case on Dec. 6, 2021 ... after authorities claim he rear-ended a truck that was stopped at a stop sign on a freeway off-ramp.
Cops say when they arrived on the scene to investigate the accident, Smith appeared intoxicated. They also claim he had marijuana in his pocket, and empty bottles of rum and vodka in his car.
Aldon Smith DUI Arrest, Prosecutors Say He Had Weed In Pocket & Empty Booze Bottles
Authorities say the person he hit suffered injuries to their back, wrist, knee, leg and foot in the crash.
Smith was eventually charged with one felony count of drunk driving causing injury -- but he cut a deal with prosecutors on Jan. 19 to close out the case. He had been facing a sentence of up to 16 months in prison following his plea agreement.
The sentence now likely ends any hope that Smith had of making an NFL comeback -- by this time next year he'll be 34 ... and three full seasons removed from playing a meaningful down in the league.