Kefee died on June 13 after a 14-hour flight to Chicago, USA for an event.
She reportedly collapsed in the course of the flight and went into coma, forcing the plane to land in Los Angeles for medical attention.
Okugbo said that he and other artistes were confident and hopeful Kefee would recover from her illness.
“Sincerely we are still in shock. She was such a vibrant, talented and sweet person.
“We pray that God will give her family, loved ones and fans the fortitude to bear such a huge loss, ‘’ he said.
Another artist Jeff Ene, said: “No! no!! no!!! Please, tell me that you are kidding me that Kefee is dead.
“I can’t believe she’s gone. Indeed there in nothing in this world. May her soul rest in peace,” he said.
“God why? I love all her songs and they give me inspiration. May she rest in peace. God knows the best,” she said.
She was fondly called the Branama Queen, because in 2007 she founded Branama Afrique, an entertainment outfit.
She was also the founder of Kefee Peace Foundation (KPF).