UPDATE | Muhammad Ali released from hospital

LOUISVILLE, Ky. (AP) — Muhammad Ali is home after being hospitalized with a severe urinary tract infection.

The three-time world heavyweight champion was released from an undisclosed hospital Tuesday night, family spokesman Bob Gunnell said today. Ali is back home and looking forward to celebrating his 73rd birthday on Jan. 17 with his family and friends, Gunnell said.

"He's in great spirits and enjoying being back home," Gunnell said. "He's back in his daily routine."

Ali has had Parkinson's disease for years.

Ali was hospitalized Dec. 20 with what was initially believed to be a mild case of pneumonia. Doctors later determined Ali had a severe urinary tract infection and not pneumonia, Gunnell said.

The Ali family appreciates the outpouring of support and well wishes, and also thanked his team of doctors and nurses, he said.

Ali and his wife, Lonnie, have homes in Paradise Valley, Ariz.; Berrien Springs, Mich.; and in Louisville. Gunnell would not say which home Ali had returned to.