Recording artist, songwriter, musician, and blue-eyed soul singing legend Bobby Caldwell has passed away at 71.

His wife, Mary Caldwell, told NBC News he died of fluoroquinolone toxicity after being on antibiotics. She explained that the legendary vocalist was diagnosed in 2017 and the illness wreaked “havoc” on his body.

Mary also shared the heartbreaking news on Twitter.

Bobby is mostly recognized for his popular song, “What You Won’t Do For Love,” a 1978 R&B anthem.

Not only did the crooner deliver this classic hit, he made many other memorable songs like “Open Your Eyes,” “My Flame,” “Heart Of Mine,” “Take Me I’ll Follow” from the soundtrack of 1988 film Mac And Me, “Jamaica,” “Coming Down From Love”, and many other timeless songs.

His music was frequently sampled in songs by hip-hop artists like Tupac Shakur, the Notorious B.I.G., and Common. His songs have been covered by Boys II Men, Natalie Cole, Michael Bolton, Phyllis Hyman, Dionne Warwick, And Go West.

Bobby is survived by his wife and their children. He was a national treasure to this world. Thank you Bobby for a lifetime of musical style, rhythm, and euphoria. Rest in peace.