pointing a gun at Kate Fleming.Now one observant viewer of the BBC crime drama believes there is another rotten apple in Jo's team who has yet to be detected.In the latest twist to season six it was revealed that murdered journalist Gail Vella was looking into the suspicious death of Lawrence Christopher - a young black man killed in police custody in 2003 after being attacked by a gang of white youths.As AC-12 member Chloe Bishop took Steve Arnott and Ted Hastings through her findings, she