Bobby Caldwell, the singer-songwriter who mastered a variety of genres, died Tuesday, his wife Mary said. He was 71 years old.

While the official cause of death has not been released, his wife told NBC News that he died of fluoroquinolone toxicity, an antibiotic he was prescribed in 2017 that wreaked «havoc» on his body.

«He was put on that with a runny nose and cough and it never should have happened, but it did and it’s irreversible if you get hit as hard as he was,» he said. «It just wreaks havoc.»

He The Food and Drug Administration issued a warning in 2016 regarding the use of fluoroquinolone in the treatment of «less serious» bacterial infections due to the disabling side effects associated with it. Warning labels were also updated in 2013 to include the drug’s potentially irreversible nerve damage.

Consumers may be more familiar with Cipro, a brand variation of quinolone antibiotics.

Influenced by the likes of Nat King Cole and the Beatles, Caldwell set his heart on a music career at the age of 17, going on to write and sing hits like «What You Won’t Do for Love» and «My Flame.» «His parents were also singers who hosted a music variety show, according to the bio on his website.

Caldwell’s ability to tap into multiple genres, including jazz and R&B, has given his catalog longevity. Her song «What You Won’t Do for Love» was sampled by Boyz II Men in 1997 for their song «To the Limit,» almost 20 years after the hit’s release.

Rapper Biggie Smalls also sampled Caldwell in the 1990s, using «My Flame» on his hit «Sky’s the Limit,» which was later used in a biopic about Small’s life and career.

Caldwell lived in New Jersey and is survived by his wife and daughters.