MINEOLA - A key witness gave potentially damaging testimony today in the trial of a former high-ranking Nassau police official who stands accused of conspiracy and official misconduct.

William Flanagan, once third-in-command of the entire Nassau County Police Department, is accused of trying to toss out criminal charges for the teenage son of a wealthy police donor in exchange for donations to the department and other gifts.

Today, the wealthy donor, Gary Parker, took the stand for the prosecution. Parker is listed as an unindicted co-conspirator, indicating that prosecutors believe he was involved in the crime, but he was never charged.

Parker testified today about his relationships with top police officials and charity work that he performed with them, including Flanagan. He spoke of paying for pricey dinners that cost more than $1,000 and also for backyard barbecues. Emails read aloud in court referenced tickets to see a Yankee game in a luxury suite with a private bar behind home plate, but it's still unclear who those tickets were for.

Parker's son, Zachary, pleaded guilty to stealing thousands of dollars worth of electronics from JFK High School and was sentenced to probation.

Flanagan's trial is expected to resume tomorrow morning.