This link was posted to /r/watchpeopledie with the title "19 YO women in Brazil stabs her rapist to death."

https://old.reddit.com/r/watchpeopledie/comments/auujg0/19_yo_women_in_brazil_stabs_her_rapist_to_death/

This comment by OP gave more information but had no source:

https://old.reddit.com/r/watchpeopledie/comments/auujg0/19_yo_women_in_brazil_stabs_her_rapist_to_death/ehapap0/

Most of the commenters automatically believed the story, and said they were glad he was dead, he deserved it, etc.

Later this comment was posted with evidence that the girl was a drug addict who fucked the dealer for drugs then regretted it and killed him:

https://old.reddit.com/r/watchpeopledie/comments/auujg0/19_yo_women_in_brazil_stabs_her_rapist_to_death/ehckqwp/

Unfortunately, few people even saw the correction.