CHICAGO (CBS) — A Chicago man was sentenced to six years in prison on Tuesday after admitting he helped rob former NBA star Antoine Walker in 2007.

Phillip Allison, 32, pleaded guilty to home invasion Tuesday. Prosecutors had alleged he helped rob Walker and bound him with duct-tape at his River North home on July 9, 2007.

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Allison was the fourth man to be convicted in connection with the robbery.

Allison and two others took Walker’s briefcase, which had $10,000 to $20,000 inside, as well as 15 to 16 custom-made watches, cuff links and a diamond necklace before restraining Walker and his assistant, Walker testified in November.

The three men, who were joined by a look-out, then told Walker and his assistant to count to 1,000.

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But Allison came back to ask Walker for the keys to his Mercedes CL550, Assistant Cook County State’s Attorney Mark Shlifka said. Allison came back yet again when he couldn’t start the luxury car.

Allison, of the 4200 block of West Van Buren, is the last man to be sentenced in the case.

Last week, Judge Kenneth Wadas sentenced Allison’s co-defendant, Demorris Hill, to 13 years in prison for his involvement in the crime.

In 2009, Antoine Larkins was sentenced to 21 years in prison and Gregory Reedfields received four years in prison.

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(The Sun-Times Media Wire contributed to this report.)