Siegfried's Heartache: Crippled Roy May Have Just Months To Live

Feeble Siegfried & Roy superstar Roy Horn is confined to a wheelchair and can no longer stand without help — 15 years after he was horrifically mauled by a white tiger during the magical duo's live Sin City show.

RadarOnline.com can reveal the 73-year-old illusionist could be facing the final curtain — and according to one medical expert, ravaged Horn may have as few as 12 months to live.

Horn shocked fans when he recently made a rare public appearance with his former stage partner, Siegfried Fischbacher. The pals stepped out last month, just before Siegfried's 79th birthday, for an event honoring their contributions to a Las Vegas brain clinic.

An eyewitness spotted Horn's nurse assisting the sickly star out of a vehicle and into a wheelchair before helping him don his scarf and rings and whisking him to the venue.

"He relies on his nurse for almost everything," said the witness, who noted the aide even

physically propped Horn up when he stood to speak to the crowd.

Dr. Gabe Mirkin analyzed photos of Horn at the event and told RadarOnline.com his immobility and inactivity put him at increased risk of congestive heart failure.

"You can only go without activity for so long. It kills," noted Dr. Mirkin, who has not treated Horn. "It's impossible to predict longevity, but given these photos, it's possible he has as little as a year to live before suffering heart failure."

But a friend fears Horn will be gone in six months. The addled entertainer was left a physical wreck after a near-fatal attack by big cat Montecore during a 2003 performance, and a source confides, "Roy rarely leaves their compound."