Hi folks thanks for the replies.
In reply to Lisa Peter was born in 1836 in Ireland so if it was him then he would have been 30 when the shooting occurred - as you said the article says he was 28 so close enough as far as absolute accuracy is concerned.
The Peter who enlisted in 1864 (address James Slip - so obviously the same Peter as involved in the shooting) had age 22 born US. The address to me confirms that they are the same person but age and birth location is wrong but not uncommon.
Peter's brother John enlisted in the navy in 1862 - his age was out by a year and his birth location given also as US but was in fact Ireland. It is definitely my John as I have his address, pension and ship he served on so again age and birth location aren't too important.
Did a bit of checking in the NY city directories and found that there weren't too many Peter O'Neils at all so making it all the more probable that the coincidences could be connected?
1861 - 4
1862 - 7
1863 - 4
1864 - 5
1865 - 6
1866 - 7
1867 - 10
1868 - 10
Lastly there's a song mentioned in one of the witnesses statements that the victim John Sullivan was singing - "I'm Lonely Tonight". This appears to be what was then a music hall favourite, the correct title being "Nora O'Neil" I wonder whether the victim was taunting Peter O'Neil in some way - my Peter had a sister (Ha)Nora???
"Nora O'Neal"
O, the nightingale sings in the wildwood,
As if every note that he knew,
Was learned from your sweet voice in childhood
To remind me, sweet Nora, of you.
But I think, love, so often about you,
And you don't know how happy I feel;
But I'm lonely tonight, love, without you,
My darling, sweet Nora O'Neal.
O, don't think that ever I'll doubt you,
My love I will never conceal;
O, I'm lonely tonight, love, without you,
My darling, sweet Nora O'Neal.
"An Alleghanians songster printed in the United States": Alleghanians, Songs Sung by the Alleghanians (New York: Printed by Edward O. Jenkins, 1866).
And good call Lisa about the 1870 census and a prison. I've not managed to locate Peter on the 1870 census at my confirmed addresses so have not been able to say for certain any of the Peters I've found are mine either by address, age, occupation, etc. I will have a look again.
As I said in my earlier message I do have other papers relating to my Peter which fall between the March 1865 and March 1866 dates so no help confirming anything only offering a possibility. One is his father James' probate from October 1865. It lists next of kin and addresses and Peter's has had "Charleston" crossed out and replaced with "undetermined". I was wondering whether he was still in the army, last known in Charleston but unknown at the time of the probate - maybe not returned from duty sort of thing.
Anyhow will carry on checking.