Nassau County Sheriff's Office mourns loss of beloved deputy to COVID-19 The sheriff's office is asking the public to keep the family and friends of Deputy Jack Gwynes in your thoughts. Credit: Nassau County Sheriff's Office Author: First Coast News Staff Published: 5:12 PM EST February 5, 2021 Updated: 5:12 PM EST February 5, 2021 NASSAU COUNTY, Fla. — The Nassau County Sheriff’s Office is mourning the loss of Deputy Bailiff Jack Gwynes who passed away due to complications from COVID-19. Gwynes died on Feb. 3, according to the sheriff's office. He was lovingly called "Grumpy" by fellow deputies and started his law enforcement career with the Jacksonville Sheriff's Office in 1995.