Mark E. O'Brien, 67, of Wethersfield, passed away April 26, 2022 at home. He was born in Hartford, son of the late John F. and Helen (Corcoran) O'Brien and lived in the area all his life. Mark was a graduate of Bulkeley High School. Prior to his retirement, he served as a Hartford Police Officer and later as a Judicial Marshal for 27 years, retiring in December of 2021 as the Head Judicial Marshal for the Appellate Court in Hartford as well as the President of the Judicial Marshal's Union. Mark was a good friend to all who knew him and was always ready to lend a hand or dispense some of his special brand of life wisdom to a friend in need or to anyone who would listen. He will be remembered for his quick wit, kindness and generosity as well as being a friend of Bill W for 33 years. Mark leaves his three brothers, John O'Brien and his wife Jennifer of Manchester, David O'Brien and his wife Constanza of Bloomfield and Gregory O'Brien of New Hartford as well as nieces, Emilee, Gabriela, and Grace and nephew Colin. A special thanks to John Matarazzo and Richie Taddei for the love and support they extended to Mark. His family will receive friends at Farley Sullivan Funeral Home, 34 Beaver Road in Wethersfield, CT from 4:00 p.m. to 7:00 p.m. on Friday, May 13, 2022. Masks appreciated. In lieu of flowers, please consider donating in Mark's name to Padre Pio Foundation of America, 463 Main Street, Cromwell, CT 06416. To extend condolences, please visit Farleysullivan.com.