'What You Won't Do for Love' singer Bobby Caldwell dies at 71 - CNBC

Bobby Caldwell, the singer-songwriter who mastered a variety of genres, died Tuesday, said his wife, Mary.

An official cause of death has not been released; his wife said he died of fluoroquinolone toxicity after an antibiotic he was prescribed in 2017 wreaked "havoc" on his body.

"He was prescribed that with a runny nose and cough, and it never should have happened, but it did, and it's irreversible if you get hit real bad like he did," she said.

The Food and Drug Administration issued a warning in 2016 about the use of fluoroquinolones in treating "less serious" bacterial infections because of disabling side effects associated with it.

Influenced by artists such as Nat King Cole and the Beatles, Caldwell set his heart on a career in music at age 17 and went on to write and sing such hits as "What You Won't Do for Love" and "My Flame."

Caldwell's ability to tap into multiple genres, including jazz and R&B, has given his catalog longevity.