Durban — Police are investigating a murder case after a man was shot and killed in Isipingo on Friday.KwaZulu-Natal police spokesperson Constable Thenjiswa Ngcobo said the investigation follows an incident in which a 50-year-old man was allegedly shot and killed by an unknown man while he was at a business premises in Old Main Road on April 26.ALS Paramedics Medical Services spokesperson Garrith Jamieson said a man believed to be a security officer was shot and killed in an alleged robbery.“Unfortunately, paramedics arrived on the scene to find that the man had sustained a fatal…