He was influenced by progressive rock artists such as King Crimson, Pink Floyd and Rush.

Subsequently, a routine operation was scheduled though several complications led doctors to suspect further problems.

D'Amour slipped into a coma in the palliative care unit of a Montreal hospital on August 25, 2005, surrounded in his final hours by family and friends.

The documentary Metal: A Headbanger's Journey, featuring an interview with D'Amour, was released on September 7, 2005.

Piggy's final recordings appear on two of Voivod's albums Katorz and Infini, released in 2006 and 2009 respectively.