Coroners Findings can be reversed, or changed, or repudiated, .. it doesn't happen very often, but sometimes fresh evidence, ( and it takes at the very least, fresh new evidence ) can bring a death back into the coroners court, even years later.
There was one in Qld, last year, I think. 4 people died in a car accident, teenagers, speeding, dirt road.. and the coroner found that the driver was negligent, and also under the influence of alcohol, in fact all the teenagers were..
Then 4 years later, fresh sworn evidence came to light that the person originally considered to be the driver of the vehicle, wasn't, ( it was a terrible mangle of a car accident ) .. . some one had said I'll be driving, to someone else. I just cant recall the details, but the original Finding of the Coroner was changed to reflect the weight of the new fresh evidence.