This is the obituary for my third great-grandmother, Margaret RYAN Murnane McMahon. It, along with the 1880 census helped me to identify that she was married prior to marrying my third great-grandfather, Timothy McMahon in 1873. The 1880 census provided the maiden names of the two daughters born to the first husband. This obituary provides the married names for those daughters. Eventually, this led me to discover an old friend was in fact a fourth cousin!
Source: Obituary for Margaret RYAN McMahon, Chicago Daily Tribune, 25 July 1928, p 30.