The alumni board of a Cornell University fraternity has decided to close the school’s chapter indefinitely, the school said Tuesday, after students who may have been involved in the fraternity were accused of attacking a black student, beating him and calling him by a racial epithet.

A Cornell undergraduate was arrested in connection with the episode and charged with third-degree assault. The Ithaca Police Department identified him on Tuesday as John Greenwood, 19.

Mr. Greenwood’s lawyer, Raymond M. Schlather, said in an email that his client was not “involved in any physical altercation of any kind.”

“Nor did he commit any crime,” he added.

The fraternity, Psi Upsilon, was banned by Cornell in 2016 after a long history of complaints that it violated the school’s code of conduct.