Fernandez was 24.
The Marlins released the following statement, and they have cancelled today's Marlins-Braves in respect for Fernandez:
"The Miami Marlins organization is devastated by the tragic loss of Jose Fernandez. Our thoughts and prayers are with his family at this very difficult time."
Major League Baseball commissioner Rob Manfred released this statement:
"All of baseball is shocked and saddened by the sudden passing of Miami Marlins pitcher Jose Fernandez. He was one of our game's great young stars who made a dramatic impact on and off the field since his debut in 2013. Our thoughts and prayers are with his family, the Miami Marlins organization and all of the people he touched in his life."
Many players took to Twitter to share their thoughts about Fernandez.
Over his fantastic, but unfortunately short, career, Fernandez went 38-17 with a 2.58 ERA and a 589-140 strikeout-to-walk ratio over 471 1/3 innings pitched (4 seasons).
Stats, though, do not even begin to tell the full story of Fernandez, who defected from Cuba and has become one of the many young faces of Major League Baseball. In the heartbreaking news today, many around the game are grieving.
Cover Those Bases gives its condolences to Fernandez's family, his teammates and the Miami Marlins organization on the loss of a figure that touched the hearts of many.