*NSYNC Star JC Chasez’s Father Dead at 73, Bandmates Attend Service

Ray “Roy” Edward Chasez, the father of JC Chasez, has died … TMZ has learned.

Sources tell TMZ … Roy died last month in Florida after a battle with cancer. This was his fifth bout with the disease.

We’re told a celebration of life was held on Saturday in the Orlando area and multiple members of *NSYNC attended.

Our sources tell us other people from the music industry also attended the service, as they knew Roy well … because JC’s parents, as well as the rest of the group members parents, were intricately involved in *NSYNC from the start, since at the time the guys were young.

Roy worked as an IT manager, and also as a contractor with the government … with offices at the White House and U.S. Postal Service headquarters in Washington, D.C. We’re told he worked with numerous charities over the years … and his family was his life.

He’s survived by his wife of 51 years, Karen, and his children — JC, Heather and Tyler.

Roy was 73.