The Kings have sent out this press release:
"This morning, in one of the most heartbreaking moments of my professional or personal life, Chuck Hayes was notified that he failed his physical exam with the Sacramento Kings. Subsequent to that, the contract signed on December 9th has been voided. At Chuck’s request, we will have no further comment at this time." - Geoff Petrie
Sad news, and I hope that everything is alright with Chuck. I was really looking forward to him being on the team.
UPDATE FROM TZ: CaliforniaJag had a great idea -- if you're on Twitter, you might want to send Chuck some well-wishes directly (@c_hayes44).