SHAH ALAM — More than a month into the murder trial in one of the most brazen, cunning and perplexing assassinations seen in a long time, defence lawyer Gooi Soon Seng was on the front foot. “When was the first time you identified them, when was the first time you saw the CCTV footage?” Seng asked Wan Azirul, a police investigator and prosecution witness. The lawyer was referring to 4 North Korean men seen on footage from Kuala Lumpur International Airport on February 13 this year. That morning, Kim Jong Nam, the estranged half brother of the North Korean dictator Kim Jong Un was poisoned with VX, a chemical weapon, while waiting at the airport to board a flight to Macau. The grainy security camera videos could be key to the case against the only two people standing trial in the case, which is being tried In a small courtroom about 20 miles from the centre of Kuala Lumpur.