According to Alderman and Vice Mayor Harold Billings, the Shelby city board and Mayor Dan Harris received a letter about a week ago related to Johnson.
While Billings could not explain what behavior is under investigation, he said the mayor suspended Johnson with pay indefinitely until the board can come to a resolution.
Harris was unavailable for comment before press time.
Because this is a matter involving personnel, Billings could not go into further details.
"He's been suspended (already) for about a week," said Billings. "Sheila Pointer is acting as the interim police chief.
"We will meet either Friday or Monday and wait to make a comment on what the issue is. At that time we'll reveal the outcome."
The Bolivar Commercial will have more information on this situation as it develops.