A private investigator (PI) has weighed in on the deaths of St Stithian teen couple Cameron Waldeck-Cooks and Ethan Coetzee, whose alleged murder -suicide has made headlines over the past few days. The 17-year-old and 19-year-old were found dead at the Wateral self-catering lodge in Mpumalanga. Police upgraded an initial inquest into a murder investigation after preliminary post-mortem findings suggested that Cameron had been strangled/suffocat…