Martin was naturalized a US citizen on October 4, 1859 in Clinton Co. Iowa.
Martin died of a heart attack suffered while he was attending All Saints day mass. I haven't seen the name Ill very often, but there was another Ill family living around Rock Island at this time. It is unknown whether they were any relation.
This other family was headed by a Frank Ill who came from Germany in 1852 and has been established in business since 1865 in mfg. and repair of wagons, carriages, sleighs,... (from 1882-1885 directory). Frank's family lives at 807 17th, includes wife Katherine (widow by 1891), Albert G, Frank Jr, John, William, Miss Katie and maybe Henry.
Sources for this individual: @S883@ @S884@ @S882@ @S885@ @S699@