He was coach to British athletics champion Jessica Ennis-Hill until her retirement.
The pair met at the Don Valley athletics stadium when Ennis was at a summer holiday camp as a teenager.
Minichiello was born in Sheffield to Italian parents who were originally from Avellino, near Naples.
They had originally met and married in Bedford before moving to Sheffield, where Minichiello's father was a steelworker.
An investigation had been launched after complaints were received from multiple female athletes and coaches.