Question: The death of which sitting member of the party formed in 1874 by Isaac Butt lead to the Dublin St Stephen's Green by-election, 1888?

Context paragraphs:
Limerick City by-election, 1888: The Limerick by-election, 1888 was a parliamentary by-election held for the United Kingdom House of Commons constituency of Limerick City on 17 April 188.  The vacancy arose because of the resignation of the sitting member, Henry Joseph Gill of the Irish Parliamentary Party.  In the resulting by-election another Irish Parliamentary Party candidate, Francis Arthur O'Keefe, a solicitor and Mayor of Limerick, was elected unopposed.

North Kilkenny by-election, 1891: The North Kilkenny by-election, 1891 was a parliamentary by-election held for the United Kingdom House of Commons constituency of North Kilkenny on 29 October 1891.  The vacancy arose because of the death of the sitting member, Sir John Pope Hennessy of the Irish Parliamentary Party, three weeks earlier.  Sir John had been elected in a hard-fought and bitter by-election the previous December, following the split in the Party between the supporters and opponents of Charles Stewart Parnell.  On this occasion, however, only one candidate was nominated, Patrick McDermott of the Irish Parliamentary Party, who was elected unopposed.

Irish Parliamentary Party: The Irish Parliamentary Party (IPP; commonly called the Irish Party or the Home Rule Party) was formed in 1874 by Isaac Butt, the leader of the Nationalist Party, replacing the Home Rule League, as official parliamentary party for Irish nationalist Members of Parliament (MPs) elected to the House of Commons at Westminster within the United Kingdom of Great Britain and Ireland up until 1918.  Its central objectives were legislative independence for Ireland and land reform.  Its constitutional movement was instrumental in laying the groundwork for Irish self-government through three Irish Home Rule bills.

South Longford by-election, 1888: The South Longford by-election, 1888 was a parliamentary by-election held for the United Kingdom House of Commons constituency of South Longford on 30 June 1888.  The vacancy arose because of the resignation of the sitting member, Laurence Connolly of the Irish Parliamentary Party.  Only one candidate was nominated, James Gubbins Fitzgerald of the Irish Parliamentary Party, who was elected unopposed.

Limerick City by-election, 1871: The Limerick_City by-election of 1871 was fought on 20 September 1871.  The byelection was fought due to the death of the incumbent Liberal MP, Francis William Russell.  It was won by the Home Rule League candidate Isaac Butt, who was unopposed.  The gain was retained by the Home Rule League at the 1874 general election.

West Waterford by-election, 1890: The West Waterford by-election, 1890 was a parliamentary by-election held for the United Kingdom House of Commons constituency of West Waterford on 24 February 1890.  The vacancy arose because of the death of the sitting member, Douglas Pyne of the Irish Parliamentary Party.  Pyne had disappeared off a boat in November 1888, and was presumed drowned.

South Sligo by-election, 1888: The South Sligo by-election, 1888 was a parliamentary by-election held for the United Kingdom House of Commons constituency of South Sligo on 6 July 1888.  The vacancy arose because of the resignation of the sitting member, Edward Joseph Kennedy of the Irish Parliamentary Party.  Only one candidate was nominated, Edmund Leamy of the Irish Parliamentary Party, formerly MP for Waterford City and Cork North East, who was elected unopposed.

County Carlow by-election, 1886: The County Carlow by-election, 1886 was a parliamentary by-election held for the United Kingdom House of Commons constituency of County Carlow on 29 January 1886.  The sitting member, Edmund Dwyer Gray had been re-elected in the general election of 1885, but having run and been elected also in the new constituency of Dublin St Stephen's Green, he chose to sit for the latter.  The County Carlow seat thus became vacant, and in the ensuing by-election, another Irish Nationalist candidate, John Aloysius Blake, was elected unopposed.

Walsall North by-election, 1976: The Walsall North by-election on 4 November 1976 was held after the resignation of sitting Member of Parliament (MP) John Stonehouse.  Elected as a Labour candidate, Stonehouse was a member of the English National Party when he resigned, after an interlude in which he faked his own death.  The English National Party did not contest the by-election, the first occasion on which the incumbent's party did not do so since the Bristol South East by-election, 1963, and the last until the North Down by-election, 1995.

Dublin St Stephen's Green by-election, 1888: The Dublin St Stephen's Green by-election, 1888 was a parliamentary by-election held for the United Kingdom House of Commons constituency of Dublin St Stephen's Green on 12 May 1888.  It arose as a result of the death of the sitting member, Edmund Dwyer Gray, of the Irish Parliamentary Party.  In April, the Times reported that Wilfrid Blunt would be the Irish Parliamentary Party candidate.  However, in a bid to appeal to Ulster Presbyterians, the Irish Party leader Charles Stewart Parnell nominated Thomas Alexander Dickson, a Presbyterian who had been Liberal MP for Dungannon and County Tyrone, as candidate.  The Conservatives nominated Robert Sexton, a member of Dublin Corporation and Chairman of the South Dublin Union Poor Law Board.  Sexton was supported also by the Liberal Unionists.  His campaign was interrupted unexpectedly by the death of his wife.

Supporting paragraphs: Dublin St Stephen's Green by-election, 1888 Irish Parliamentary Party
Answer: Edmund Dwyer Gray