UFC star Conor McGregor tweeted Tuesday that he has "decided to retire young."
The tweet was posted one week after Joao Carvalho died from injuries suffered during a fight earlier this month that was attended by McGregor.
McGregor, 27, is scheduled to fight Nate Diaz at UFC 200 on July 9. The fight would be a rematch of their bout from earlier this year, when Diaz upset McGregor at UFC 196.
McGregor, who was ringside at Carvalho's fight in Dublin, Ireland, posted a message last week to his Facebook account, writing "To see a young man doing what he loves, competing for a chance at a better life, and then to have it taken away is truly heartbreaking."