He had called for the release of another monk suspected of supporting self-immolations.
His brother says he was freed because 'his chances for survival appeared dim.'
He had helped to dismantle a statue of a 'protector' deity denounced by the Dalai Lama.
The talks proceed despite warnings by China that it will 'seriously damage' bilateral ties.
The third meeting between the two leaders comes amid human rights concerns in Tibetan-populated areas in China.
The two had called for the right to use Tibetan as the language of instruction in their schools.
Chinese authorities have held the trio for nearly two weeks for what Tibetans call a meritorious action.
Chinese authorities cremate his remains in secret.
His is the second Tibetan self-immolation this year.
Chinese authorities say the measures are aimed at cracking down on 'criminals.'
They call for the return of the Dalai Lama and freedom from Chinese rule.
But the move is welcomed as having huge symbolic impact in support of Tibetans under Chinese rule.
Protests grow larger as repeated appeals yield no result.
The Chinese authorities hand over his body to family members.
He self-immolates 'for the cause of Tibet.'
The move follows another show of force in neighboring Draggo county.