The couple is believed to have known Ms Ross, who was also a Christian volunteer, through their work. Officers started probing Ahmadzai after his wife allegedly reported her husband had been behaving suspiciously on July 30. She handed them to police believing they were bought with Ms Ross's money. CCTV footage gathered by police showed the Afghan man arriving by car at Ms Ross's ground-floor flat on the evening of July 16. The last confirmed sign of life from Ms Ross was recorded at 9.41pm on July 15, when she called a close friend.