Butler is known as one of if not the best players to come from the USA; with him listing the inaugural World Matchplay in 1994 as part of his vast array of achievements. Only this past weekend; he was playing with Darin Young in the PDC World Cup of Darts which makes this even more of a shock.
Young as well as the likes of Michael van Gerwen, Raymond van Barneveld and Kim Huybrechts all posted get well soon messages on social media with the darting world shocked and saddened at this news.
https://twitter.com/OfficialPDC/status/1004622997708263424?s=19