nicholas pence , 25 , and his father david , 56 , had friends round to celebrate a victorious football game on wednesday in their rural new orleans home .
their guests left at midnight , moments later they were both shot dead .
david was shot three times in his chair and nicholas was shot twice with tactical shotgun .
quiet wealthy community reeling , said both men ` got on with everybody '
two teenagers , aged 17 and 18 , charged with the killing .
police believe it was a botched burglary , connected them to car break-ins .