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I found a number of records on your family. All the records list that Michael Fitzgerald was a horse trainer. He and Mary Prinderville were married in Listowel in 1870. They had three children that I could locate: Michael 1871, Honora 1874 and Margaret 1877. Mary died in 1880 at age 28 from cancer. All of these events were in Listowel.
I was not able to locate a death record for Michael either in Dingle or Listowel. He may have been exercising the horse and had an accident or he may have been in a race and was killed. He also could have been kicked by a horse.
Let me know what questions you have.