The 81-year-old star said: "She's not very well. But those were the cards we were dealt, so we'll play with them. More than half a century of happy years is a lot to draw on."
Hagman, who reprised his role as J.R. Ewing in DALLAS, was diagnosed with throat cancer and says he wouldn't have got through it all without the help of his co-stars Linda Gray and Patrick Duffy.
He told the Daily Mail newspaper: "I had a rough patch there last year when I was shooting. But I do have two very good friends on the show, and they supported me, as did the writers and producers, who gave me all the time off I needed for the therapy, and it went very smoothly, did it not?"
Pocono grad Kelly Monaco aims for another DANCING WITH THE STARS win
She's joined in the semifinals of ALL-STARS by the National Football League's all-time leading rusher, Emmitt Smith; Olympic speedskater Apolo Ono; Olympic gymnast Shawn Johnson and former BACHELOR contestant Melissa Rycroft.