TMZ.com reports that former Portland Trail Blazers forward Shawne Williams pleaded guilty to marijuana possession following an arrest in December.

Ex-NBA player Shawne Williams has pled guilty to possession of a controlled substance following his December arrest ... when cops busted him for smoking a blunt inside his Porsche.

...

Following the arrest, Williams was charged with possession of a controlled substance (for the weed) and possession with intent to sell (for the codeine).

Williams pled guilty to weed possession today and was sentenced to one day in jail and a $500 fine. He was given credit for time served and has already paid the fee.

Williams did not suit up for the Blazers but was included in the trade package -- along with Mehmet Okur and the 2012 first-round pick that became Damian Lillard -- that came to Portland from the New Jersey Nets in exchange for forward Gerald Wallace during a March 2012 trade. Williams was sidelined down the stretch of the 2011-2012 season because of a foot injury.

Williams had a player option for the 2012-13 season which he decided to exercise in June. A few weeks later, the Blazers formally waived Williams, buying him out of the last year of his deal.

Williams, 27, holds career averages of 5.7 points and 2.8 rebounds per game.

-- Ben Golliver | benjamin.golliver@gmail.com | Twitter