NCAA Stands for "National Collegiate Athletic Association which is responsible for banning schools from participating in sports for at least a year.
The death penalty is the harshest form of penalty it can give, and most of this punishment result in schools not competing in sports for the duration of the death penalty.
The imposition of "Death Penalty" by NCAA Forces a school to eliminate a sport which they face the punishment for, which can be a year or more depending on NCAA.