Marsh was born in the Perth suburb of Armadale on 4 November 1947 to Barbara and Ken Marsh. Marsh played backyard cricket with his older brother Graham, who became a professional golfer and won eleven times on the European Tour.
Both brothers represented Western Australia at cricket at the schoolboy level. Marsh played his first competitive match at the age of eight for the Armadale under-16s, where he also kept wicket. At thirteen he captained the state schoolboys’ team, and joined the West Perth district club
Ros is popularly known for being the wife of the late cricketer Rodney Marsh. The pair had been together for a long time until the death of Rod. Rod passed away at the age of 74, leaving all his loved ones behind. Before his death, he got taken to the hospital following a heart attack incident.
His wife, Ros, and family are currently in a massive loss and mourn his death.