Oklahoma City Thunder assistant coach Maurice Cheeks is "doing well" after an undisclosed medical episode occurred while he was on a flight to Philadelphia on Wednesday, according to a team official.

Cheeks is said to be in "good spirits" and was released from a Philadelphia hospital Thursday.

Mo Cheeks is hospitalized after a medical episode on a plane. AP Photo/David Zalubowski

Cheeks, 60, played 15 seasons in the NBA and won a championship in 1983 with the 76ers. He was nominated for the Basketball Hall of Fame in December but was not elected.

Known for his close relationship with Russell Westbrook, Cheeks has been an assistant coach with the Thunder for six seasons, in two different stints. Cheeks has had three head coaching gigs, with the Trail Blazers, 76ers and most recently the Pistons in 2013-14.

Cheeks had hip surgery in February of 2016 and spent a month away from the Thunder recovering. A Thunder team spokesman said they're awaiting the test results before releasing more information about the medical incident.