Calvin Munerlyn, 43, died at a Flint hospital after he was shot in the head Friday, Michigan State Police Chief David Kaiser said.
Ramonyea Travon Bishop, 23, Larry Edward Teague, 44, and Sharmel Lash Teague, 45, is charged with first-degree murder, along with other charges, the Genesee State Attorney's Office said in a statement Monday.
Sharmel and Larry Teague are married, and Bishop is the son of Sharmel, according to the prosecution.
"From all indications, Mr. Munerlyn simply did his job of maintaining the governor's executive order related to the COVID-19 pandemic for the safety of store employees and customers," Genesee State Attorney David Leyton said.
Munerlyn went into a verbal altercation with Sharmel Teague after telling Teague's daughter that she needed a mask, according to the prosecution. Surveillance video confirms the incident, Leyton said.
Sharmel Teague's daughter left the store, but "Teague started yelling at Munerlyn who then asked her to leave the store and asked a cashier not to serve her," the prosecutor's office said.
Under an executive order from Michigan's Prime Minister Gretchen Whitmer, all store employees and customers must wear a mask.
Recordings also show that the woman pulled into an SUV just after the turn. But about 20 minutes later, the SUV returned.
Two men – identified as bishop and Larry Teague – entered the store, according to the statement. One of them yelled at Munerlyn not to respect his wife, Leyton said. The other man, later identified as a bishop, allegedly shot the security guard, the statement states.
Police are looking for Larry Teague and bishop, the prosecutor's office said.
Sharmel Teague is in custody and awaiting arraignment on her charges in the 67th District Court.
In addition to the murder charge, Bishop is also charged with felony weapons and carrying a concealed weapon, the prosecutor's office said.
Larry Teague is also facing two firearms-related crimes, one charged with a felon who was in possession of a firearm, one charge of possessing a concealed weapon and one of violating the governor's executive order, according to the prosecutor's office.
Sharmel Teague also faces a firearm crime, the statement said. She doesn't have a lawyer yet, John Potbury, Deputy Chief Attorney for Genesee County, told CNN.
Randy Guiler, Dollar Tree's vice president of investor relations, said the company is "aware of the tragic event."
"We will continue to cooperate fully with local authorities on their investigation," Guiler said in a statement to CNN. "As always, we are committed to ensuring a safe environment for our colleagues and customers. Out of respect for family privacy, we do not comment further at this time."