Source: Michael Doyle Their Name Liveth For Evermore: The Great War Roll of Honour for Leicestershire and Rutland.
He was the son of Frederick Tarr, a coal merchant, born 1860 in Spitalfields, Whitechapel, Middlesex and his wife Emma Tarr (nee Sedgwick, married on the 15th April 1885 in Christ Church, Ironville, Derbyshire), born 25th September 1862 in Codnor Park, Derbyshire and was baptised on the 5th April 1863 in Christ Church, Ironville. Francis Nathaniel was born in 1887 in Ironville, Derbyshire and was baptised on the 25th September 1887 in Christ Church, Ironville, he had one sibling, a sister, Mabel Dorothy, a schoolgirl, born 1886 in Ironville and baptised on the 27th February 1886 in Christ Church, Ironville, also residing with the family was Francis’s maternal Uncle William Sedgwick, an iron mongers apprentice, born 11th June 1871 in Codnor Park, in April 1891 the family home was at 90, London Road, Leicester. In March 1901 Francis was residing in the family home at Knighton Park Road, Leicester, together with his father, a lithographic printer, his mother and sister Mabel, also residing in the family home was his maternal Uncle William Sedgwick, a cigar manufacturer. In April 1911 Francis was absent from the family home at The Crofts, Stoneygate Road, Leicester, residing there was his father, a lithographer, his mother and sister Mabel. Francis’s father died at The Croft, Stoneygate Road, Leicester on the 22nd June 1914, aged 54 and his mother died at Hillside, Guildford Road, Leicester on the 29th January 1925, aged 72.
At the outbreak of war Francis had held a position in a legal practice in Leicester. An account taken from the Leicester Mercury on the 8th November 2008 records. Frank was not only a brilliant lawyer, Oxford University graduate and former Uppingham Schoolboy, he was also centre for Leicester Tigers and England. Frank had made his Tigers debut aged 18 against Gloucester, and went on to play 94 games for the club, scoring 72 points. Between 1909 and 1913, he won four England caps – memorably running in two tries when England beat France 22-0 at Welford Road in 1909. A Lieutenant in the 4th Battalion, Leicestershire Regiment, Frank died during the Battle of Ypres on the 18th July 1915, a month short of his 28th birthday. He was hit in the face by shrapnel from a German shell as he urged his fellow soldiers to take cover.
Francis’s Army enlistment documents have not been sourced at present, all that is known of his military service is that he gained a commission into the Leicestershire Regiment, and was posted to the 1/4th Battalion and with this unit he first entered the theatre of war in France on the 3rd March 1915. At the time of his death he was serving as a Lieutenant and was the Battalion’s Acting Adjutant. He was awarded the 1914-15 STAR, British War Medal and Victory Medal.
The War Diary records: 18 Jul-15 - Fine – wind breezy Northerly. At 5.40pm Lieutenant F. N. TARR (Acting Adjutant) was killed by splinter from crump whilst visiting ZILLEBEKE LAKE dugouts. 2nd Lieutenant R. C. HARVEY took over duties of Adjutant. At 9.30pm Battalion relieved 5th LINCOLNSHIRE REGT at ZILLEBEKE LAKE dugouts. Casualties, officers killed Lieutenant F. N. TARR, other ranks 2 men wounded.
On Thursday 22nd July 1915 The Leicester Daily Post published the following article under the heading. “LEICESTERSHIRE AND THE WAR.” – DEATH OF LIEUT. F. N. TARR. – FAMOUS TIGER KILLED IN BELGIUM. HIT BY A SHELL. We regret to announce the death of Lieut. Frank N. Tarr, of the 1/4th Leicester’s, who was killed in action in the neighbourhood of Ypres, Belgium, on the 18th inst. The news reached the town indirectly on Tuesday night through a passage in a soldier’s letter, but it was not confirmed until yesterday morning when his mother, who lives at The Croft, Stoneygate-road, Leicester, received a letter stating that her son was killed by a shell. Lieut. Tarr joined the Leicester Territorial’s before the war broke out, and when the crisis came he was among the first to volunteer for active service. He accompanied his battalion to Luton for training preparatory to going to the front, and whilst there organised one or two teams to meet Mr. Crumbie’s side in a friendly game of football on the Welford-road Ground. He was a popular and efficient officer, and not a little daring in carrying out the exacting duties he was called upon to discharge. His high conception of duty was a stimulus to all who came in contact with him, and his cheery unaffected disposition won him the affection of comrades and friends. A little more than a week ago he was given a few days leave, and visited his mother and friends in Leicester. He was then in excellent health. The only information received as to the circumstances of his death, was that he was struck on the head with a shell. The deceased officer was educated at Uppingham School and Oxford University. After concluding his career at Oxford, he commenced the study of the law, with a view to making it his profession. He was articled to Messrs. Owston, Dickinson, Simpson and Bigg, and was about to take his final examination when called up to serve with the colours. Locally he was best known as an exceedingly clever Rugby footballer, and a most valued member of the Leicester Football Club. On going up to Oxford he created such a good impression that he was given his “Blue” in 1907, and played regularly for his University, that season and the two succeeding ones. In 1909 he was capped for England, and played against Wales, France and the Australians. In the season 1912-13 he played against Scotland. The characteristic feature of his play was its variety. He could probably pick out the weak links in the defence of the opposition as quickly as any man, and having done this he never failed to take full advantage of it, He was not one of those showy players who now and again excel on great occasions, but his work was always consistently good, and his invariable practice was to enable his colleagues to take advantage of his skill rather than seek to emphasise his own brilliance. His death is one of the greatest blows the Leicester Football Club has ever sustained. He was to Percy Lawrie what the late A. O. Jones was to Ernest Hind. In both cases the highest qualities in the wing men were developed by the brilliant work of their centres, who forgetful of themselves, always sought to bring success in combination with their colleagues. Lieut. Tarr was an ideal footballer, both in temperament and skill. He never descended to a mean action; such a thing was foreign to his nature. He was indeed, a charming man. No man could be any length of time in his company without realising that he was not only a sportsman of the highest qualities, but a gentleman. His death will be mourned, not only by those nearest and dearest to him, but by thousands of others in Leicester and the county, and indeed in many parts of England, who recognised in him a great player, and who looked to him to show those qualities he possessed to such a high degree as a footballer in the civil walks of life.
On Monday 26th July 1915 The Leicester Daily Post published the following article under the heading. “WITH THE 4th LEICESTERS.” - “The Death of Lieut. Tarr.” – Belgium, July 19th. The Battalion has sustained another serious loss. Yesterday our adjutant, Lieut. Tarr, the well known Leicester International Rugby footballer, was killed by a shell. His loss is deeply deplored by all ranks. He was a sportsman in every shape and form, and one of the bravest of the brave, never sparing himself. He was a man everybody would follow. The most dangerous duties he did himself, and by his example made dangerous work seem quite safe. Every officer and man feels his loss deeply.

Source: Leicestershire War Memorials Project.
He played Rugby Union for Oxford University (awarded three Blues), Leicester, Headingley, Richmond, and England (for whom he was capped four times, as a centre, thrice in 1908-09 and lastly in 1913). He made 94 appearances for Leicester FC's 1st XV between 1906 and 1913, and scored 24 tries.
https://royalleicestershireregiment.org.uk/entity/124525-tarr-francis-nathaniel?q=