In [Chamber of Secrets], when Harry, Ron and Hermione are trying to figure out what Tom Riddle did to get a trophy with his name on it:
"Could've been anything" said Ron. "Maybe he got thirty O.W.L.s or saved a teacher from the giant squid. Maybe he murdered Myrtle; that would've done everyone a favour . . ."
Of course, Tom Riddle/Voldemort did kill Moaning Myrtle.
— Quora user Anoochan Pandey