Anyone with information about either case is asked to call the homicide division directly at 314-444-5371 or leave a tip with CrimeStoppers at 866-371-8477.
Protesters carried signs describing Don Kauerauf as a tyrant. Kauerauf has repeatedly stated that he doesn't support government mask or vaccine mandates.
More than 50 students and community members in the Dunklin R-5 School District chanted with signs on Monday following a school board vote earlier in January.
In a Facebook post, the Belleville Police Department said they worked with state, local and federal agencies in Missouri and Illinois to locate and arrest the man.