Anton Julius Iversen missing in Brooklyn c.1904

Anton Julius Iversen was born in 1851 in Glemmen parish. Married to Camilla Arnesen 18 Nov 1879 and moved to Brooklyn New York in 1896. He was a sailor and family stories have him drowning and never seen again on his silver wedding anniversary. I can't find any records to support this story other than that by 1905 Camilla is listed as a widow on records. I can not find a death record for Anton. Any ideas of how to find an account of his death?