Celebrity website TMZ was the first to report the development Thursday.
This March 8, 2007 file photo shows attorney Harland Braun outside a Beverly Hills, Calif., courthouse.
It says his case can not be resolved until Polanski, who has both French and Polish citizenship and lives mostly in Paris, returns to California to face justice.
The alleged deal apparently indicated Polanski would only serve 48 days behind bars.
At which point, Judge Laurence Rittenband allegedly took the plea deal off the table and informed prosecutors he sought a 50-year prison sentence for the Hollywood mainstay. That's when Polanski fled the USA for Europe.
USA authorities have been playing a cat-and-mouse game with Polanski for years, trying to get Poland and France to extradite him.
After striking an "open plea" deal later that year - a deal that left sentencing up to the judge - Polanski, who was 44 at the time, pleaded guilty to engaging in unlawful sexual intercourse with a minor.
Thousands protest Trump in Mexico City
Trump has insisted a wall along the almost 2,000-mile US border with Mexico would be paid for by Mexico. The marchers protested Trump's plans for a border wall and increased deportations of migrants.
The woman who was raped by Roman Polanski when she was 13 years old has spoken out, saying she hopes the film director will become a free man once more.
The attorney, Braun, is now asking the L.A. County Superior Court judge to enforce that ruling. He wants to freely travel in Europe and visit Tate's gravesite at Holy Cross Cemetery in Culver City.
His second wife, actress Sharon Tate, was a Manson Family murder victim in 1969, at the age of just 26. Polanski had lured her there on the pretext of photographing her for French Vogue.
For the 83-year-old, the threat of extradition has also left him unable to visit his daughter, who's located in London.
Roman Polanski has sent a request to a judge to allow the filmmaker to return to the United States without serving any additional jail time.
He has yet to return to the United States, however, not even in 2003 to pick up an Oscar for best director for his harrowing Holocaust drama, "The Pianist" - one of his eight Academy Awards.
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