[contentcards url=”https://www.iol.co.za/news/politics/top-witness-and-forensic-report-author-in-jacob-zuma-corruption-trial-dies-89ef721a-11f9-4131-860c-a63ee6784406″ target=”_blank”] By Tarryn-Leigh Solomons Johan van der Walt, the main witness and author of the forensic report in the corruption trial against former president…