(Washington, DC)  --  A congresswoman from Washington state is calling for a federal investigation, after learning that a veteran from southwestern Washington died after his cancer treatment was delayed for three months.  Republican Representative Jaime Herrera Beutler made the investigation request in a letter to VA Secretary Robert McDonald, saying the cancer appeared to have been a treatable diagnosis had the patient received timely care.  "The Olympian" reports the case involves 66-year-old veteran John Weston, who was diagnosed with a tumor in his liver in July.  Herrera Beutler says when Weston was finally able to schedule an appointment in October, it was too late, as the tumor had burst and was spreading cancer through his body.