EUSTIS - Donald R.C. Knowles, 75, resident of Eustis, Maine passed away at home after a lengthy battle with cancer on April 6, 2024. Don was born on March 8, 1949, in Westbrook, Maine, the son of M. Elizabeth Knowles and Donald R.C. Knowles. Don was educated in Falmouth schools, graduating in 1969 from MCI