caused by the loss of her family members , and at her November 2004 Social Services evaluation , she reported many life stressors that led to her intrusive thoughts , nightmares , and flashbacks , but these did not include any event in service . The Veteran ' s VA psychiatric evaluation found that the Veteran ' s psychiatric disorder was not a result of service , and that they were instead due to her dependent son ' s physical condition and her deceased son ' s murder . As the examiner explained the reasons for his conclusions based on an accurate characterization of the evidence of record , this opinion is entitled to substantial probative weight . See Nieves - Rodriguez v . Peake , 22 Vet