Haido Hotel.
With the killer's identity already known, Conan quickly figured out how Kenzo Masuyama had committed the crime.
The method Kenzo Masuyama had used was actually simple. He had coated the chandelier in the venue with fluorescent paint beforehand.
Once all the lights in the hall were switched off, the fluorescent paint would become a conspicuous target. Kenzo Masuyama could then use a silenced pistol to shoot through the chandelier's suspension ring, sending it crashing down onto Shigehiko Tonokura's head.
To keep anyone from noticing the muzzle flash, Kenzo Masuyama had also covered the muzzle with a handkerchief.
But... that very action had allowed Conan to find evidence of his crime.
Everyone entering the venue had received a colored handkerchief, with seven colors in all.
Of everyone given a purple handkerchief, only Kenzo Masuyama had lost his-and Conan happened to have picked it up.
Jesselai, all they needed to do was recover Kenzo Masuyama's DNA from the sweat on the handkerchief and test it for gunshot residue. Then... they could establish that Kenzo Masuyama was the murderer.
Conan had delivered all of this reasoning using Naruto's voice.
Naruto got a taste of what it felt like to be a famous detective's mouthpiece... his only regret was probably that he hadn't let Conan stick him with an Anesthesia Needle...
As for Kenzo Masuyama, he didn't deny his crime. After all... the evidence was already conclusive.
But he wasn't worried. He believed the organization wouldn't abandon a veteran member like him.
Little did he know that, upon learning of Kenzo Masuyama's arrest, Gin had immediately ordered the three snipers to add him to their kill list.
With the case solved, Officer Megure approached Naruto and said with a broad smile, "Who would have thought we'd have another such...