Pompey was sentenced to 15 and 17 years imprisonment on the first and second counts of rape, respectively.
He had rejected an earlier plea bargain which would have seen him jailed for 65 years if he pleaded guilty He was raping Amber, then 12, in a downstairs living room while holding a knife to her throat when Dominick intervened.
She tried to escape after he attacked, but Rivera also slashed her throat - though she survived.
The court directed that the three sentences be served consecutively.
The indictments against the man stated that on January 10, 2012 and between June 1 and June 30, 2013, he engaged in sexual penetration of the girl; and that between May 1 and May 31, 2011, he engaged in sexual activity with the girl by rubbing her breast.
The comments section is intended to provide a forum for reasoned and reasonable debate on the newspaper's content and is an extension of the newspaper and what it has become well known for over its history: accuracy, balance and fairness.