Someone called the cops- otherwise, who did the arrest?
Followup stories indicate that this was not an isolated crime.
Sorry, I don't know how to do links, so you'll have to cut and paste.
http://www.wrcbtv.com/story/30886848/timeline-the-sequence-of-events-surrounding-the-ooltewah-basketball-player-rape-case
Here's another from ESPN that has more horrific details.
http://espn.go.com/espn/otl/story/_/id/14615417/3-tennessee-high-school-officials-answer-charges-failed-report-abuse