Mohammad Arif, who used the alias Ashfaq, was handed the death sentence for his role in the December 2000 attack that killed three people at the Mughal-era fort, the lawyer told reporters.
"The court said this was a direct attack on the Indian government and by attacking the Red Fort they wanted to prove they could strike anywhere in India," the lawyer said.
Ashfaq and five other armed men had sneaked into the Red Fort late on December 22, 2000, and opened fire, killing two soldiers and a civilian. Three of the attackers were later killed in gun battles in New Delhi and occupied Srinagar.