(CNN)The picture says it all: a black eye. Cuts and scrapes all over his face. A swollen lip. Police say the mugshot was taken after William Mattson was accused of sexually assaulting a woman. The police department in Conway, South Carolina, posted the photo on its Facebook page along with an explanation that its officers had gone to a residence about 1 a.m. Thursday after reports of a sexual assault. They found 52-year-old Mattson in the condition seen in the photo. According to police, the injuries were inflicted "by someone acting in defense (of) the victim." Conway Police charged Mattson with first-degree criminal sexual conduct. He is being held at the J. Reuben Long Detention Center in that city, just inland from Myrtle Beach.
William Mattson is charged with criminal sexual conduct in Conway, South Carolina . Police: Someone acting in defense of the alleged victim injured him before officers arrived .