Covid-19 has been the No. 1 killer of law enforcement officers in 2020 and 2021. According to the Officer Down Memorial Page, which tracks the on-duty deaths of police officers in the United States, more than 470 have died as a result of contracting the virus in the line of duty since the start of the pandemic. That is more than four times as many officers who have died from gunfire. Among the covid-19 fatalities: Louisiana Police Lt. DeMarcus Dunn, 36, who died the day before his wedding; Edgardo Acosta-Feliciano, 48, a U.S. Customs and Border Protection officer who leaves behind a wife, a daughter and two sons; Michael Weiskopf, 52, a traffic homicide investigator for the St. Petersburg police remembered for his kindness in dealing with people involved in serious crashes. None had been vaccinated.