That thought I used to have also but in practice it did not worked for many reasons.
1.The death chart are at internet usually either of famous person or of unusual death, which both cases will show different charts than something normal like for example regular people dying in a car accident.
Death is death. It doesn't matter if you're famous or not.
2. After studying a lot this matter I came to conclusion that death is probably one of those chart cases that can be shown very different its almost unique like unique is the way person will feel it.
It takes more than a natal chart and a solar return chart to predict death.
You have to do a ray chart to see where the Benefics (Jupiter & Venus) cast their rays. Where ever they cast their rays mitigates death or serious injury.
Every natal chart also has a killing Star that will show prominently in the solar return, the lunation and profection charts.