As per his brother, Edward's bio, this is said of the RIGGS plot at the old Presbyterian Church in Newark, where many of the headstones are illegible: Mr. Henry Earle Riggs in his 'Our Pioneer Ancestors', published in 1942, relates that about 1917 he visited the graveyard at the old Presbyterian Church in Newark and found the Riggs plot. He found many graves going back to Revolutionary days, but unfortunately many of the stones were then broken and illegible.

His family was as follows: Son of Sgt Edward (Immigrant) Riggs II and Elizabeth RIGGS, da. of ?? Rosa?;
Husband of Hannah BROWNE Riggs , dau. of John & Mary BURWELL BROWNE.
Father of Elizabeth DODD; Samuel Riggs; Zopher Riggs and John Riggs
Brother of Edward Riggs; Sgt. Samuel Riggs; Mary Day; Lydia Riggs; Elizabeth Riggs; Hannah Riggs and John Riggs
SOURCE: PAGE 14, RIGGS Family book online
ROOSA: "The Riggs Family Genealogy" by John H. Wallace pub 1901 -

"Edward Riggs {son of Edward(1) the immigrant} was born in England about
1614, and came to this country along with his father and family; landing
in Boston, MAss., in the early summer of 1633. He assisted his father in
preparing a new habitation and in taking care of the sick until April 5,
1635, when he married Elizabeth Roosa, quite a young girl; a daughter of
a family of that name who had come over from England and settled in
Boston.(http://www.axtell-surname.org.uk/fam22949.html).
Of his brother SAMUEL RIGGS: Our Pioneer Ancestors" by Henry Earle Riggs, pub 1942

"The foregoing data is abstracted from Orcutt's "History of Derby, Conn."
The volume is filled with reference to the descendants of Samuel Riggs,
the son who remained in Derby. The family was prominent there for more than 200 years after Edward turned the farm over to his son Samuel in
1666. "The farm on Riggs Hill near Derby, Connecticut, is said to be a
beautiful location and to be fine land.