Crystal Dynamics revealed that Rhianna Pratchett has left their team in a tweet from the official Crystal Dynamics account this afternoon. Ms. Pratchett was one of the writers responsible for the reboot of the Tomb Raider franchise in 2013 with Tomb Raider and as well as 2015's Rise of the Tomb Raider. She has helped re-shape Lara Croft for a new generation of gamers.
There's no word on what she will be doing next but it looks like the split was amicable and it will be interesting to see where the franchise and Ms. Pratchett go next.