According to death records held by the state of NJ, Thomas Trewin died (1875) of consumption (pulmonary tuberculosis) & his wife Mary Ann died (1878) of apoplexy (a stroke). Both were just 58 years of age.
They’d left England in 1857, so they had been in this country for about 20 years. Thomas worked as a carpenter. You may remember that in his teens he served back in England as an apprentice to master carpenter Joseph Binks.
They were buried in Evergreen Cemetery, Union County, NJ. Two grandchildren who died as infants were buried with them.