Nihon University said Friday that Masato Uchida, its former head football coach, resigned from the board of directors on Wednesday for "causing tremendous trouble" to the school and other entities through the dirty tackle scandal involving one of the players.

Uchida offered to step down Wednesday after he and former assistant coach Tsutomu Inoue received a lifetime ban from competition in American football the previous day in connection with the May 6 incident, which took place during an intercollegiate game against Kwansei Gakuin University.

The ban, the heaviest punishment possible, was handed down by the ruling body for college football in Tokyo and surrounding areas.