A man who fatally hit a surgeon at Box Hill Hospital could become the first person jailed under Victoria's one-punch laws and be given a mandatory minimum of 10 years behind bars.

Joseph Esmaili, 24, was last year found guilty of manslaughter after a jury found he killed Patrick Pritzwald-Stegmann by punching the heart surgeon once to the face in the foyer area of the hospital on May 30, 2017.

Joseph Esmaili could be jailed for 10 years for manslaughter. Credit:Jason South

Meanwhile, the surgeon's grieving widow says the remorseless killer compounded her family's trauma through a lengthy trial.

Mr Pritzwald-Stegmann's wife, Christine, said her husband's death had devastated her and their daughters, who were too scared to visit their father while on life support.