Johnson & Johnson. No relation.

When he finds himself alone and unarmed with McClane, Hans pretends to be an innocent bystander named "Bill Clay". McClane gives Hans a gun, which seems like a fatal mistake, but the gun turns out to be unloaded, meaning McClane knew or at least suspected that "Bill Clay" wasn't who he claimed to be.

Knowing John is barefoot, Hans has Karl shoot the glass walls of the office John is trapped in. John still manages to escape, but now his feet are cut to shreds and he's leaving behind a trail of blood.

POWELL: I ... I shot a kid. Eleven years ago. Oh, it was dark ... he was big for his age ... damn ray gun he had looked real enough ... yeah, I had all the right excuses ... but afterwards ... I really couldn't draw my gun again.

Agents Johnson & Johnsons die in a fiery explosion when the terrorists blow the roof off of Nakatomi Plaza.

After McClane shoots him in the shoulder, Hans staggers backwards, crashes through a broken window and ultimately plummets to his death on the pavement of the plaza 30 stories below.

ROBINSON: [watching Hans fall to his death from the 30th floor] Oh, I hope that's not a hostage.

As John and Holly exit the building, a bloodied Karl emerges behind them wielding a machine gun. As John shields Holly, preparing to get shot, Powell draws his service revolver and shoots Karl dead.