<p>The wife of a Karen human rights defender who was disappeared last year has requested the Department of Special Investigation (DSI) to investigate the disappearance of her husband as influential people are suspected in the case.</p> <p>Phinnapha Phrueksaphan at 10 am on Thursday, 6 August 2015, submitted a letter to the DSI to request the agency to take up the case of her husband, Porlajee Rakchongcharoen, aka Billy, a Karen human and community rights activist, who disappeared on 17 April 2014.</p>