The New Jersey State Archives has a free, online database of New Jersey World War I Deaths. The collection includes some photographs.
“More than 3,400 New Jersey men were killed in action or otherwise died while in United States service during World War I, 1917-1918. In late 1919, the U.S. War Department issued, to the adjutant generals of each state, sample cards for the recording of service information for deceased soldiers and sailors. This database includes 3,427 name entries, linked to an information card or photograph, or often both. The information cards provide the following data: name; service number; race; residence; place and date of enlistment; place and date of birth; organizations served in and dates of assignment/transfer; date killed or otherwise died (if not killed in action, cause of death); wounds or injuries received; and the name and address of the person notified of the death. The photographs included in the series measure 3.5″x5.5″, and contain (usually) an oval-shaped, reproduced image (frequently from a military portrait).”