Local law enforcement officers gathered at Hamilton Park Thursday to remember officers who have given their lives to protect the community. Police chief Aaron Goldstein says in the city’s history, four Fond du Lac police officers have been killed in the line of duty. Officer William Prinslow, in 1898, officer Nick Klaske in 1961 and officer Craig Birkholz in March 2011. State trooper Trevor Casper was shot and killed in Fond du Lac on March 24, 2015 while attempting to apprehend a bank robbery and murder suspect. Officer Joseph Kurer died in the line of duty in 2021 from COVID-19. The Fond du lac Police Department hosted a memorial ceremony Thursday afternoon at the Police-Fire Memorial in Hamilton Park.