Even if there wasn't any evidence of the Saudi Royal family's involvement in Khashoggi's death before, I believe it was widely accepted that it was in fact the Saudis who did it when it was first reported back in 2018.
The Saudi government was/is corrupt for a long time now so I'm not surprised by their actions, what has been happening in Yemen in recent years is clear testament to that. These people in my opinion do not deserve to have custody of the two holy cities of Makkah al Mukarramah and Madinat an Nabi.