Marcelo Fabian Pecollo, a music teacher and trumpeter with the Moron city orchestra, was sentenced in 2010 to 30 years in prison for molesting five preschool children. He was freed in 2014 after a sentence reduction.
The attack took place on October 30 at the cathedral in Moron, a Buenos Aires suburb.
The group of parents barged into the cathedral yelling: "There is a paedophile and a rapist in the church and he is playing in this orchestra."
"When I arrived, those people were leaving," priest Jorge Oesterheld told local media. "He was in a very, very bad way, until the police and ambulance arrived. He was in a coma and died on Friday."
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The priest criticised the attackers.
"They say they took justice into their own hands, but it was revenge, it was murder."
Pecollo was arrested in 2007 after a mother complained that her four-year-old child had been abused. Six other cases later came to light.
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