morrislin on Family Tree Circles

My ggrandfather was born in Newfoundland,in1882/83;He married a Nellie Rich from Pennsylvania;He did his naturalization papers in 1899;He lived in Poughkeepsie NY,they had 2 children,Robert L b 1906 and died in 1917 by drowing;A daughter named Alfreda b 2-3-1908 was murdered in Newark NJ 1-15-1933.The wife Nellie died in 1967.Upon checking,williams name and death year are on a stone in the cemetery,but the plot is empty and other than the year can find no information on him.We know he registered for the Draft in Sept 1918 in New Brunswick NJ,but lived in NY;Please if you have any information as to what happened to him or the actual month and day he died it would be appreciated.We also know he worked for Wright-Martin air corp and was a fireman in Poughkeepsie,also worked at a place called Schatz factory.Thank You