Aaron Donald's agent, Todd France, reportedly sent the Los Angeles Rams a letter in May informing the team of Donald's intention to retire, according to the NFL Network's Ian Rapoport.
The letter was intended to be passed along to the NFL, but the Rams never sent it. Instead, the team and France reignited contract talks and eventually settled on a $40 million raise for Donald on the three remaining years on his contract, keeping him with the team and on the field.
Per that report, the Rams and France had a scheduled meeting for the day after the letter was sent, and it was a productive one. So the two sides scheduled another meeting, and several more after that, all behind the backdrop of Donald's potential retirement.