This afternoon, via Twitter:

David Carson @PDPJ
Gov. Eric Greitens has left the state Capitol building in Jefferson City
4:03 PM – 1 Jun 2018

Jimmy Benoist @JayBenoist
As I was the first person fired by Greitens at DOLIR, @EricGreitens here is where you file for unemployment benefits [….]
4:03 PM – 1 Jun 2018

Thirty minutes later:

Missouri SOS Office @MissouriSOS
Our office has received a letter of resignation from the Governor.
[….]
4:33 PM – 1 Jun 2018

Previously:

It’s Resignation Day (June 1, 2018)

He knew. We knew. They knew. Everyone knew. (June 1, 2018)