A South Carolina man was severely beaten after allegedly raping his nephew's girlfriend on New Year's Eve.

AllTheNews.com is reporting that William Mattson, 52, can be seen in his mugshot with an eye swollen shut and cuts and bruises. The sexual assault suspect is accused of attacking the woman at a party while his nephew –the victim's boyfriend –was away, according to Myrtle Beach Online.

The nephew told police that he heard sounds coming from inside his father's bedroom when he returned to the party. He kicked down the door and says he found Mattson on top of his girlfriend. He said he punched Mattson repeatedly, driving him from the house.

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Public Service Commission candidate Peter Hubbard gets a hug from Brionté McCorkle, executive director of Georgia Conservation Voters, during an election-night party in Southwest Atlanta on Tuesday, Nov. 4, 2025.  (Ben Gray for the AJC)

Credit: Ben Gray for the AJC