He was the nephew of Charles and Jerome Lalemant, and became a Jesuit
at Paris, 24 March
He arrived in Canada, 20 September, 1646 and after remaining in Quebec
for two years, was sent to the Huron missions as de Brébeuf's assistant.
He was scarcely there a month when the Iroquois attacked the settlement of St. Ignatius which they burned, and then descended on the mission of St. Louis where they found de Brébeuf and Lalemant. After setting fire to the village and killing many of the inhabitants, they led the two priests back to St. Ignatius where they were tied to stakes and after horrible torture put to death.
Lalemant stood by while his companion was being killed. De Brébeuf expired at three in the afternoon. Lalemant's suffering began at six that evening and lasted until nine o'clock next
morning. When the Iroquois withdrew, the bodies of the two priests were carried over to St.
Mary's where they were interred. Some of the relies of Lalemant were subsequently carried to Quebec.
Died in the Huron country, 17 March 1649