Denny Corea is the Cuban father of Emily McKenna, who was abused by Corea's ex-girlfriend Jamie Huntington-McKenna.
Corea was threatened with prison time and being barred from Emily by Jamie's new husband, Randall McKenna, if he didn't leave the McKennas with primary custody. It was harder being an immigrant and previously having a record of robbery and assault before he turned his life around.
He assumed Randall molested her from seeing bruises she would cry about during her visits with him. Confronting Randall outside his office to get a confession, Randall just laughed and threatened him with deportation whether he was guilty or not, degrading his parenting over nothing. Seeing red at that point, Corea beat him critically enough Randall ended up in the ER.
Corea was arrested, and it's never specified if he was deported back to Cuba or charged and imprisoned in America. (SVU: "Legacy")