State Auditor Nicole Galloway has announced she will not be seeking reelection in 2022:

Nicole Galloway @nicolergalloway
Serving Missourians has been the honor of my life. I’ve been humbled by your support and I’m deeply grateful for the opportunity it has given me. Today I am announcing that I will not be a candidate for State Auditor nor any other office in 2022. [….]
9:40 AM · Jun 4, 2021