Hello Ruby, the incident I am sure was well reported at the time and I found one mention is in the Schools Folklore Collection, in about 1937 / 38 all children in the senior classes were asked to write stories that they heard at home and who told them, the idea being that folklore etc would be captured, these stories are in the process of being put online and there is one story as you mention, I doubt there are two similar stories in the same area. This I think proves your story and here is the link, https://www.duchas.ie/en/cbes/5009204/4997455/5104446 you may find some family member if they were the age, about 10 to 14 I think, I found a number by an aunt and my parters mother has 14 there so with luck you may find something interesting.
Back in the real world I checked the Roscommon library but there collection is only available to visit, they have newpapers for the time, I know in other counties you can identify and request the newspaper page for about €1 each minimum charge €10, there is a search option on key words though to ID the piece with a one line on the search item, do not see it on this library site, however I you could try the Irish Newspaper Archive or the Irish Times site, both subscription, I joined the Irish TImes at one stage for a week and found a lot of stuff but it has to national news, that would be and as well as the news reports you would get the inquest also.
I do not know a lot about Roscommon even though ancestors come from neighbouring counties, however nearly every county and sometimes area have a Facebook page on local history.
Newspapers here https://www.irishnewsarchive.com/ and https://www.irishtimes.com/archive
Good Luck
Pat