Hi! I am a distant cousin:
Your ancestor Michael J. Murnane was an older brother of my great-grandmother, Catherine Teresa :Kate" Murnan who married George Francis "Frank" Egan. My dad, Joe Egan (son of George Jr and Emily Biggs Egan), and his sister Rosemary both told me about their "uncle" (actually he was a great-uncle) who went out to Denver. I have developed a pretty complete MURNAN tree for our branch of the family and would love it if you would take a look and point out any errors. I have not been able to find your Michael's grandparents, but I do have good info on his dad and his mothers name (Anne Mangan). Hoping to hear from you soon!