American Idol Alum Dexter Roberts Has Rocky Mountain Spotted Tick Fever

Singer Dexter Roberts, who finished seventh place on last season’s American Idol, abruptly left the show’s live tour in July due to an unknown illness.

Now Roberts, 23, has shared via his Facebook page what was responsible for taking him down.

American Idol's C.J. Harris & Dexter Roberts Have Been Friends for Years

All the American Idol contestants sang duets on Wednesday, but one pair had a head start on building chemistry.

“We’ve been friends for about five years,” C.J. Harris told reporters of fellow contestant Dexter Roberts. “We performed our duet ["Alright" by Darius Rucker] back at home.”

Harris, 23, and Roberts, 22, found each other randomly, and were brought together by music, while on spring break in Panama City.

Go Behind the Scenes at American Idol

American Idol has been on the air for 13 seasons, but somehow there are still plenty of behind-the-scenes tidbits you can’t see from home.

“There is a lot of stuff that I did not know,” contestant Dexter Roberts tells PEOPLE.

So what are these unearthed gems? Here are five secrets about the FOX reality show.