Source: Jason Kempin / Getty Donnie McClurkin, the Grammy-winning gospel singer and pastor known for songs like "We Fall Down" and "I Call You Faithful," is facing serious allegations of sexual assault in a new lawsuit obtained by NBC News. The lawsuit, filed by Giuseppe Corletto, accuses McClurkin of sexual assault over the course of more than a decade while serving as both his spiritual mentor and employer. It also contains an alleged email in which McClurkin apologized for his actions, calling himself a "dirty old man.