The obituary does not specifically state his place of burial. It does state that his funeral was held in New Brunswick after his remains were first transported from New York to Plainfield. His wife and daughter are buried in this cemetery as are his mother-in-law and father-in-law. No burial records exist for this cemetery and there is no grave marker for him in this vandalized cemetery.

His name is incorrect in the obituary. The father of Dr. Charles R. Thiers was William F. J. Thiers. William J. R. Thiers was his son. It was reported in the New York Times that W. F. J. Thiers died in New York City during a heat wave in which 93 people died. He was seventy-six years of age, lived at 215 East Twenty-third Street, was stricken by the heat at 98 Third Avenue, and was taken to Bellevue Hospital where he died.

There is no known birth record for William Fitz James Thiers and his exact date of birth, place of birth, and parents are not known.

William Fitz James Thiers married Susan Hankinson Boice, daughter of James V. S. Boice and Jane Runyon, on 25 February 1849 at Herbertsville, Middlesex County, New Jersey by the Reverend Joseph F. Philips of St. Peter's Episcopal Church in Spotswood, New Jersey. She was born 22 September 1823 at New Jersey and died 5 November 1897 at North Plainfield, New Jersey. According to her obituary, "she was very deaf and for 30 years had hardly heard a human voice."

They had 2 children:
- Charles Rudolph Thiers born 3 December 1849 at New Jersey and died 10 Jul 1920 while at Bristol, Lincoln, Maine where he had gone "in hope that a change in climate would be beneficial." He married first Ella L. Van Voorhis, daughter of Barker Van Voorhis and Elizabeth Snedeker and married second Florence Lansing Pelletreu, daughter of Charles H. Pelletreu and Francis Louise Pelletreau.
- Lyranthia born July 1851 and died 10 June 1871 at the age of 19 years, 11 months. She was unmarried.

At the time of his death, his occupation was inventor. His name is associated with Patents 117484 and 22377 related to ventilation on ships and filed in the late 1870s.

In the 1855 New York State Census, William Fitz James Thiers was living in New York City. Other members of his household were his sister-in-law Jeanet Thiers and two servants. In the 1860 census his wife and child lived at Piscataway, New Jersey in a household her parents. In 1870 she and their children lived at New Brunswick in a household with her parents. In 1880 she lived at Plainfield, New Jersey in a household with her son. Her obituary stated that she died at the home of her son.

There is conflicting information regarding his place of birth:
- His death record stated that he was born in New York. The death certificate was completed by a doctor in an hospital which according to newspaper reports was overwhelmed by the number of heat-related cases.
- The 1855 New York State Census taken 16 June 1855 stated that he was a native (not naturalized) voter. There were two servants listed in his household. One was born in France and the other was born in Germany. So this was not a case where the census taker was repeating the same information for everyone in the household.
- Census records for his son, Charles Rudolph, state that his father was born in France (1880, 1910, 1920) or New Jersey (1900).
- The death record of his son Charles states that William Fitz James Thiers was born in France. The information was provided by the second wife of Charles Thiers.
- A newspaper report on page 1 of The Sun dated 1 April 1867 stated that William Fitz James Thiers was a native or New Orleans.
- No immigration or naturalization records for William Fitz James Thiers have been found.

Check back for additional updates on his run-ins with the law and the likelihood that his last name was Rugggles.