Christopher, I checked all the indexes I have here right now (Illinois Dept. of Public Health Death Index Deaths 50 years and over for ROLL, and noone with exactly the dates and names you gave me is on it. I checked Social Security Death Index, and there were some people with the right names, but the dates didn´t fit. I found a Roll, Helen in the 1923 City Directory for Chicago which I´ll send as an attached file to your e-mail address, but I don´t know if this is “your” Helen Roll. Charlotte and Helen may have got married and changed their names. Apart from that, I only found an Edgar Roll, b April 6, 1874 in Muhlenberg, Kentucky.
I´ll keep my eyes open for your names and dates and I´ll let you know if I find something that fits. - Ute