A Charles Sturt University (CSU) academic who provided expert evidence at a murder trial of 25 defendants in South Africa in 1989, will attend a local screening on Thursday 13 September of A Common Purpose, the award-winning feature-length documentary about the trial. Associate Professor Graham Tyson, lecturer and researcher at the CSU School of Psychology in Bathurst, was one of the defence team’s expert witnesses in the trial in which 25 people were found guilty of the murder of one person. “In South Africa at that time, if a person was found guilty of murder, they automatically faced the death penalty, unless extenuation could be proved,” Professor Tyson said. “These 25 people faced the death sentence. I had given evidence in a number of such trials on the psychological factors that could influence people in crowds and which could reduce their ability to foresee the consequences of their behaviour. That evidence had been accepted as grounds for extenuation in an earlier trial, and therefore I was asked to testify in this case. Organising the defence case was a huge undertaking, and the film shows what a remarkable job defence lawyer Ms Andrea Durbach did. It is a very moving film and, when I saw it, it raised a lot of old emotions in me.”