Lisa Koppel, the wife of Danny Koppel, fondly known as R&B singer Danny K, has been praised for her brave fight against an illness that took her life over the weekend. DANNY K’S WIFE REMEMBERED FOR BRAVE FIGHTIn an emotional Instagram post, Lisa Koppel’s sister Justine Gundelfinger paid tribute to her sibling. Danny K and his wife Lisa Koppel. The boundless love, strength, kindness, patience, and good values she gave them will live within them forever and remain among the greatest expressions of her legacy. Justine revealed that Lisa Koppel had died after a brave battle with an illness.