According to Herat officials, Farhad who received death sentence yesterday was involved in about 40 terrorist attacks including the killing of two foreign aid workers, Local elders, Afghan National Police and Afghan National Army soldiers.
Court ordered imprisonment to two other persons in charges of assisting the killer.
One was announced five years and another was announced 2 years and six months imprisonment.
The crime of killing aid workers took place in July last year.
Gunmen riding on a motorbike opened fire at a Taxi in which two Finnish female aid workers were traveling killing both of them on the spot.
The deceased were employees of a christian aid charity International Assistance Mission (AIM).
IAM has been operating in Afghanistan since 1966.
The organization was in the past blamed by Taliban for preaching Christianity but IAM has rejected the claim.