Conversation so far:
Can you provide me with a little information on Harry Potter and the Half-Blood Prince?
Voldemort does not appear in Harry Potter and the Half-Blood Prince, although his presence and actions are felt.
What was Lord Voldemort like in his youth?
Riddle was outwardly a model student, but was in reality a psychopath who took sadistic pleasure in using his powers to harm and control people.
Was Lord Voldemort successful in having Death Eaters attack Hogwarts?
The cabinets allow Voldemort's Death Eaters to enter Hogwarts, where battle commences and Dumbledore is cornered.
What else took place during this time of the attack on Hogwarts by Death Eaters?
Hogwarts professor Severus Snape uses the Killing Curse against Dumbledore when Draco could not force himself to do so.

Question: What else did he do after murdering his father and grandparents?
Self-contained rewrite: What else did Lord Voldemort do after murdering his father and grandparents?