Facts:   - conviction: first-degree murder    - death place: santa bárbara , costa rica    - sentence: 32 years    - victims: 4    - death date: 11 june 1984    - country: costa rica      - birth date: 21 november 1908    - name: beltrán cortés carvajal    - apprehended: august 23 , 1938    - image: beltrán cortés carvajal.jpg    - birth place: santa bárbara , costa rica    - cause: prostate cancer   Based on these bullet points, write a short biography describing the life of beltrán cortés .
beltrán dalay cortés carvajal -lrb- 21 november 1908 - 11 june 1984 -rrb- was a convicted costa rican murderer , mostly known for the murders of the physicians ricardo moreno cañas and carlos echandi .he is one of the most famous former prisoners of san lucas island .