Mark Cosgrove

Mark Cosgrove, 75, of Johnson City, passed away peacefully on October 30, 2026. He was born on May 19, 1951, in New Haven, CT, to Daniel P. and Alice (Brown) Cosgrove. Mark is survived by his wife, Linda O'Niel, of Johnson City; his son, Jay Nils Cosgrove (Dana Gusley) of Farmington, NH; nine nieces and nephews, Lauren Barnes of Silver Springs, MD, A Prentice (Pat) Barnes of Branford, CT, Kathleen Cosgrove of Branford, CT, Eileen Barnes, of Branford, CT, Daniel T. Cosgrove (Marie) of Greenwhich, CT, James Cosgrove (Nicole) of Branford, CT, Meaghan Swanson (Justin) of Branford, CT, Kevin Cosgrove of Branford, CT, and Clare Stowers (Jeffery) of Pointe Vedra Beach, FL. He was precede in death by his sister, Susan Barnes; and his brother, Daniel T. Cosgrove.

Mark was a long-time resident of Branford, CT, and moved to Johnson City, TN, in 2013. He has deep family roots in Branford, CT. Mark graduated from Branford High School in 1969 and worked in the family construction business, Cosgrove Construction, INC., as a heavy equipment operator and demolition expert for the better part of thirty years. Mark was a proud member of the IUOE Local 478. He also spent many winters in Lake Placid, NY, training with the Olympic Bobsled team, a sport that was his passion. He was a Realtor and owned several commercial real estate properties in Branford, CT and Johnson City, TN.

Mark loved to read political literature and was heavily involved in politics. He loved to travel and his travels brought him such destinations as Ireland, Germany, Greece, Africa, Alaska, and the Caribbean Islands. He also enjoyed theater and musical venues. Mark has been and Elk for over fifty years. Since 2013 he was a member of BPOElks Lodge 825 in Johnson City, TN. As an Elk, he was involved with volunteer services at Mountain Home VA Medical Center. He was a communicant of St. Mary's Church of Branford, CT, and Johnson City, TN.

A private Graveside Service will be held at Oak Hill Cemetery inn Johnson City, TN. In lieu of flowers, please make donations to the Dan Cosgrove Animal Shelter - 749 E. Main St. Branford, CT 06405, in memory of Mark M. Cosgrove.