Warren Buffett has stopped donating to the Gates Foundation, ending a two-decade philanthropic partnership following revelations about interactions between Microsoft co-founder and philanthropist Bill Gates and the late sex offender Jeffrey Epstein.

Buffett said on Tuesday he is donating about $6 billion of Berkshire Hathaway stock, comprising 12 million Class B shares, in his annual midyear donation to four family foundations overseen by his daughter Susie and sons Howard and Peter.

The announcement by the 95-year-old Berkshire chair?did not mention ?the Gates Foundation, which has received more than $47 billion of the conglomerate’s stock since Buffett said in a 2006 letter he was “irrevocably committing” to donate shares throughout his life. Buffett ?donated more ?than $17 billion of stock to the four family foundations in the same period. “Of course, mortality is unpredictable, but my remaining shares will be ?donated to the four foundations one way or the other by Dec. 31, 2034,” Buffett said in a statement.