Johnny Carson has donated $600,000 to help build a theater at a high school in Norfolk, Neb., his hometown.

Carson sent the check in response to a letter from a school board member, Norfolk School Superintendent Jim Merritt said.The $5.7 million construction project at Norfolk Senior High School includes a 1,200-seat performing arts theater, a gym and new classrooms. In 1988, the "Tonight Show" host donated $650,000 to the Carson Regional Radiation Center at Norfolk's Lutheran Community Hospital. Last year, he gave $50,000 to the Northeast Nebraska Zoo in Royal.