Olgiati was the political radical of the conspiracy, bearing no known grudge against the Duke, but rather acting out of Republican ideals.
He claimed in a subsequent confession that many of ideas were the product of studying under Cola Montano a Humanist educator who had first suggested the assassination.
Olgiati was soon involved in a conspiracy with Lampugnani and Visconti, two older officials who each had more personal reasons to assassinate the Duke.
The Duke died during the attack and everyone - assassins included, quickly fled the church except for Lampugnani who was struck down.
The bodies of these three men were torn from groin to neck and affixed to the gates of Milan as a warning to others; the heads separated and displayed on lances on the city's belltower.