I do not know where he was born, just the approximate year of birth.
The only source that I have is this newspaper article documenting his death....
MANCHESTER TIMES
Friday 16th December 1898
TRAGEDY IN HYDE-ROAD
SUICIDE OF AN ARTILLERY SERGEANT MAJOR
A sad tragedy occurred last night week, shortly after half-past five, at the Manchester Artillery Headquarters in Hyde-Road. Brigade Sergeant Major. J Sadler cut his throat while in a state of delirium resulting from pneumonia, and his death occurred soon afterwards.
Sergeant-Major Sadler lived at the headquarters. He had held the office since 1892, after serving 14 years in India, and was a favourite with all ranks of the brigade.
He had caught a chill, its is thought, through waiting to welcome the returning troops of the Manchester Regiment. On Saturday morning he was so unwell that Dr. Heathcote ordered him to bed again and there he remained up to Thursday, the attack having developed into a case of acute pneumonia.