Source: Michael Doyle Their Name Liveth For Evermore: The Great War Roll of Honour for Leicestershire and Rutland.
He was the son of John Ernest Theophilus Chapman, a boot maker and dealer, born 1854 in Loughborough, Leicestershire, and his wife Elizabeth Anne Chapman (nee Cumberland, married in the 4th quarter of 1876 in the Loughborough, Leicestershire district), born 1856 in Loughborough, John was born in the 1st quarter of 1889 in Loughborough, his siblings were, Edith, a schoolgirl, born 1879, Dorothy, a schoolgirl, born 1882, Hubert Frank, a schoolboy, born in the 1st quarter of 1886, Helen, born 1887 and Gladys, born 1890, all his siblings were born in Loughborough, in April 1891 the family home was at 34, Park Lane, Loughborough. In March 1901 John was residing in the family home at Ashby Road, Loughborough, together with his father, now a boot manufacturer’s travelling agent, his mother and siblings, Dorothy, Helen, Gladys and Harold Ernest, born 1896 in Loughborough. In April 1911 John was an electrical engineering student, and was residing in the family home at Westfields, Ashby Road, Loughborough, together with his father, now a commercial traveller, his mother and siblings, Helen, Gladys and Harold, a schoolboy. His elder brother Hubert also died.
The War Diary records: 20 May-15 – 5.00 – 7.00pm Evening artillery bombardment, shrapnel and high explosive. 2 shells fell in F.6. Our artillery bombarded Hill 76 and redoubt facing South East extremity of G.1. Relief by 4th LINCOLNSHIRE REGIMENT completed 12.20am 21.5.15. NOTE. During the occupation, 3 hand grenades were thrown from G.1 without result. The wire there has been completed. Casualties: 2nd Lieutenant C. W. SELWYN died of wounds. Captain J. CHAPMAN wounded. Men. 3 killed, 3 wounded.
On Tuesday 1st June 1915 The Leicester Daily Post published the following article under the heading. “LOCAL CASUALTIES.” – LOUGHBOROUGH OFFICER’S DEATH FROM WOUNDS. – Much regret is felt in Loughborough at the death of Captain John Chapman, of the first 5th Battalion Leicestershire Regiment, who died from wounds on Sunday in hospital in London. The gallant Captain was out with a sniping party when a shot smashed his binoculars and inflicted such serious wounds that little hope was entertained of his recovery. He was the second son of Mr. Ernest Chapman, of Ashby Road, Loughborough, and was formerly in the works of the British Engineering Company. He was a very able and popular young officer, and deep sympathy is felt for his relatives. A military funeral will be accorded to the remains, which will be interred in Loughborough Cemetery on Wednesday afternoon. There will be a service in the Parish Church at 3 ‘o’clock, to which admission will be by ticket, to be obtained from Messrs. Clifford and Clifford, Baxter-gate. The 1/5 Battalion Leicestershire’s will attend, together with the National Reserve and Volunteer Training Corps.
On Friday June 4th 1915 The Melton Mowbray Times & Vale of Belvoir Gazette published the following article under the heading. “DISTRICT WAR ITEMS.” – LOUGHBOROUGH OFFICER’S DEATH FROM WOUNDS. – Much regret is felt in Loughborough at the death of Captain John Chapman, of the first 5th Battalion Leicestershire Regiment, who died from wounds on Sunday in hospital in London. The gallant Captain was out with a sniping party when a shot smashed his binoculars and inflicted such serious wounds that little hope was entertained of his recovery. He was the second son of Mr. Ernest Chapman, of Ashby Road, Loughborough, and was formerly in the works of the British Engineering Company. He was a very able and popular young officer, and deep sympathy is felt for his relatives.
On Saturday June 5th 1915 The Leicester Chronicle and Leicestershire Mercury published the following article under the heading. “BIRTHS, MARRIAGES AND DEATHS.” – DEATHS. CHAPMAN.- On May 30th, at the Military Hospital, Wandsworth, from wounds received in action, Captain John Chapman, 5th Battalion Leicestershire Regiment, second son of Ernest Chapman, Westfields, Loughborough, aged 26. No flowers.

Source: Leicestershire War Memorials Project.
Commemorated on the family memorial at Loughborough (Leicester Rd) Cemetery, along with his brother Hubert.
Information from S Kallaste, 12/04/23