Jay-Z performs during the 'On The Run Tour: Beyonce And Jay-Z'

Jay-Z performs during the 'On The Run Tour: Beyonce And Jay-Z' at the Rose Bowl on August 2, 2014 in Pasadena, California.

 Larry Busacca/PW/WireImage for Parkwood Entertainment

A San Diego man has pleaded not guilty to biting off a man's fingertip during a Jay Z and Beyonce concert at Pasadena's Rose Bowl.

Twenty-five-year-old Roberto Garnica entered pleas Tuesday to mayhem, battery and battery with serious bodily injury.

He could face up to eight years in state prison if convicted.

Los Angeles County prosecutors say Garnica was at the concert on Saturday when he groped a woman and pushed her into some chairs, sparking a fight with her husband.

Authorities say Garnica punched the man and then bit off the tip of his left index finger.