Setee says he's accompanying Raymond Robinson, who began his hunger strike 10 hours after Spence launched hers nearly three weeks ago.
The 51-year old is calling on Prime Minister Harper to withdraw the recent omnibus legislation, Bill C-45.
Robinson says he'll continue his hunger strike until the prime minister and governor general meet with him and Spence.
Setee says it's a sad day in Canada's history when First Nations people are ready to sacrifice their lives to get the government to work with First Nations leadership to recognize, respect and honour their treaty rights.
A visibly weak Spence made a brief appearance on Sunday as a parade of politicians and protesters turned up the volume to demand action from the Harper government.
She acknowledged the support of the growing Idle No More movement, which has held demonstrations in cities across Canada in recent weeks.
Her teepee is situated on an island in the frozen Ottawa River looking up at Parliament Hill.
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