We're making use of another deleted scene here. In this scene, Anakin gets into a fight with a young Rodian. After Qui-Gon breaks up the fight, we learn from Wald (Anakin's Rodian friend) that the Rodian Anakin was fighting is named Greedo.

This was originally intended to be the same Greedo who later encounters Han Solo in the cantina in Mos Eisley in Episode IV. However, the scene was cut, and then material published in a series of comics after Episode I established in the Star Wars Extended Universe canon that Greedo was only 19 years old when Han Solo killed him. Because of this, the "Greedo" seen in this deleted scene is now canonically described as being Greedo the Elder, the father of Greedo the Younger (the one Han Solo shot). At the time this scene takes place, Greedo the Elder is about 12 years old (his birth date is not established) and won't father the younger Greedo for another 13 years.

Or ever, in our version.

Transcript

GM: As you return to the town, you see Anakin in a fight with a green alien boy.
Qui-Gon: Hey! Break it up!
GM: Anakin tosses the alien roughly aside. <roll>
GM: Oh...
[SFX]: Krunch!!
GM: The alien boy lies motionless. He's dead.
Qui-Gon: What?
Anakin: He said I cheated in the pod race!
Qui-Gon: You killed him?
Anakin: I... I dunno what happened. I got really angry; I couldn't control myself.
Qui-Gon: You killed him?
Anakin: It... it was an accident. Honest.
Qui-Gon: Come on. I have to go talk to your mother.
{they leave}
Wald: I always knew that Greedo would come to a bad end.