Died: January 17, 1929, age 84 years, 10 months and 14 days, buried in St. John's in the Wilderness Cemetery
Married: Emma Wills (died Mar 9, 1929). The 1920 U.S. Census state Sylvester is divorced, living in Brighton.
Children: Gertrude E. Otis Cochran
Lake Placid News, Friday, March 12, 1926
Aged Guide Celebrates 82nd Birthday
Sylvester Otis, famed as a guide throughout the entire Adirondacks, and still active at his chosen work in the Paul Smith's section, celebrated his eighty-second birthday at the home of his daughter, Mrs. Charles Cochran in Saranac Lake last week Wednesday.
Mr. Otis served for three years in the Civil War as a member of Major Gibbon's sharpshooters. He was a pioneer when the late Paul Smith began the erection of his famous hotel in what was then practically an uncharted wilderness.
Tupper Lake Herald & Adirondack Mountain Press, Thursday, January 31, 1929
NOTED GUIDE DIES AT SARANAC LAKE
Sylvester Otis, a veteran of the civil war and noted Adirondack guide and woodsman, died at Saranac Lake a few days ago, aged 84 years. He was stricken with heart failure during the night and died before morning. Up to the night of his fatal illness Otis had never complained of illness, and was unusually active for a man of his advanced years.