The 65-year-old former model - who was previously married to Rolling Stones guitarist Ronnie Wood - paid tribute to her sibling Paul Karslake, who died on Monday (23.03.20) morning after being rushed to hospital with breathing difficulties on Sunday (22.03.20).
According to The Sun Online, a source said that the family believe he had coronavirus as his decline was "incredibly sudden" and the 61 year old hadn't been ill prior to his death.
Jo paid tribute to her sibling on Instagram and posted a picture of the pair together.
She wrote: "This is my brother @Paulkarslakefa who died today ... I love him so much I'll miss him so much a funny, talented, wonderful, father, husband and brother... life won't be the same without him. RIP brother. I love you #brother #heartbroken #seeyouontheotherside #alwaysinmyheart."
A statement on Paul's Instagram page confirmed that he had passed away, although stated that the artist's cause of death is currently unclear.
The statement, posted yesterday, said: "It is with deep sorrow that we have to announce Paul's sad passing this morning.
"He was taken to hospital to hospital yesterday morning with breathing problems and at present we do not know the exact cause of his passing.
"The family have also asked that you try not to go to Paul's workshop as it is shut and in this current time it is dangerous to gather with the guidelines for self isolation.
"It is however appreciated how much he was loved.
"Paul was a fantastic husband, a wonderful father, an amazing family man and an excellent friend to all. He is now at peace.