Reggie Perumal didn’t testify in the Pistorius trial but was present when Gert Saaymans, the State pathologist, conducted Reeva’s autopsy.
“A star pathologist hired by Oscar Pistorius told AFP on Thursday he will not testify at the athlete's murder trial, another blow for his defence after a week of savage cross-examination.
Private forensic pathologist Reggie Perumal - who joined Pistorius's hand-picked team soon after Reeva Steenkamp was killed on Valentine's Day morning 2013 - will not take the stand, amid suggestions his post-mortem findings support key parts of the prosecution's case”
https://www.news24.com/SouthAfrica/Oscar_Pistorius/Top-pathologist-hired-by-Oscar-wont-testify-report-20140417
See also
https://mg.co.za/article/2014-04-17-oscar-trial-defence-pathologist-wont-testify
Mr Perumal also assessed the crime scene. It was he who, after seeing a mark on the toilet wall, realised that a spent bullet was in the toilet bowl and suggested it be retrieved.
https://www.dailytelegraph.com.au/news/world/csi-toilet-door-key-to-oscar-pistorius-defence-as-pathologist-warns-against-injustice/news-story/c234f592d2253c368351df01ed7cc39f
“Roux also said defence experts had recovered a bullet and fragments from the toilet bowl that police missed. Mangena said he was aware of that”.
Perumal found it, Wolmarans retrieved it.