Arnold Palmer died Sunday at the age of 87. The legendary golfer won seven major championships, including four at the Masters, but his biggest contribution to the sport, and to the PGA Tour in particular, was to give it mass appeal, as a handsome, swashbuckling fan favorite who defied the country-club stereotype.

Current and former PGA players poured forth their feelings in the wake of the news, many taking to social media to express their sadness and admiration for “The King.” Here is a sampling of the golfers’ reactions.

Moments after winning the Tour Championship and the FedEx Cup on Sunday, Rory McIlroy had this to say (via Golf Digest’s Brian Wacker): “Arnie put the game on the map. Don’t think any other sportsperson in any sport did for their profession what Arnie did for the game.”

The exact cause of death for Palmer, who passed away at University of Pittsburgh Medical Center Presbyterian Hospital, is not yet known. He was at the hospital in preparation for heart surgery.