I would say - yes.
The point of prison is to punish an offender, and prevent him or her from re-offending via the harsh lesson of incarceration.
It's apparent that this man will be punished daily for the rest of his life, so prison is unlikely to increase or diminish that punishment, and would simply deprive his grieving family of his support, and him of theirs.
It was an accident, although a law was broken, but we have to assess these issues from a human point of view, and I believe the judge has correctly done so.