The head of the MLB's player's union Michael Weiner has died at the age of 51, reports ESPN.
Here's what you need to know:
1. Weiner announced to The Daily News that he was undergoing chemotherapy for a malignant brain tumor in November 2012.
2. His health had taken a severe decline throughout the summer months of 2012.
3. He died at his home in the Mansfield Township in New Jersey.
4. There has been an outpouring of emotion on Twitter:
Lost a great friend today. Michael Weiner's body finally succumbed to cancer. One of the best leaders & men I knew. Prayers for his family.
— Brad Ziegler (@BradZiegler) November 22, 2013
Sad to hear about the passing of Michael Weiner. A class act. A huge loss for baseball.
— David Lennon (@DPLennon) November 22, 2013
— John W. Henry (@John_W_Henry) November 22, 2013
Sad to hear news about Michael Weiner, deepest condolences to his loved ones. His sacrifices as head of players union will not be forgotten.
— Jose Bautista (@JoeyBats19) November 22, 2013
Michael Weiner was a special man,honorable,smart,a leader,kind,loving,witty, & the BEST in the arbitration room; he will be missed..R.I.P
— JIM BOWDEN (@JimBowdenESPNxm) November 22, 2013
— Sky Kerstein (@SkyKerstein) November 22, 2013
5. Former All-Star Tony Clark is expected to be confirmed as the new head of the player's union during the group's conference in December.