http://www.techradar.com/news/gta-6-release-date-news-and-rumors-mapping-the-path-to-grand-theft-auto-6

Update: Thus far we've had no confirmation that Rockstar is even thinking about starting working on the sixth installment of the Grand Theft Auto franchise and a recent change on a motion capture actor's resume that started the rumor mill off once again has now been confirmed to be a fake.

Discovered by NeoGaf, Tim Shell's CV shows credits for both Red Dead Redemption 2 and Grand Theft Auto 6. The CV has the same listing across two sites (Resumes Breakdown Express and iStunt).