As mentioned, likely the most well-known fallen Jedi who became a Sith is Anakin Skywalker/Darth ... it much further than ...

While the Jedi and the Sith are well known for their mastery of the Force, other Star Wars heroes and villains have found ...

Star Wars: The Force Unleashed offered players an ultimate power trip, allowing them to feel like an all-powerful Jedi or Sith capable of causing massive destruction. The game's intense set pieces ...

Now, Order 66 is the command given ... Considering Anakin was dressed as a Jedi – even though he'd fallen to the dark side and become a Sith by the time of the command – then "surely Anakin ...