In high school, he played football and, during his senior game, completed the game winning pass, at the cost of breaking his leg in thirteen places in the process. According to a story on Weazel News he was a computer technician.
After quietly conferring with fellow hostage Luis Fernando Lopez, who thought it was a bad idea to stand up to the armed robbers, he comments on his experience as a football player and says that "the world is built out of bad ideas my friend".
Eugene is then seen drawing a concealed pistol and opening fire, killing Michael Keane. He is immediately shot several times and killed in retaliation by Packie.
Like many other recurring characters, his model is updated in The Ballad Of Gay Tony. His character adopts a standard pedestrian model in GTA IV.
During the robbery cutscene in GTA IV, when Eugene shoots Michael, he is kneeling, but in the opening cutscene in The Ballad of Gay Tony, he is standing up.
In TBoGT, it appears that Packie is the only one to shoot Eugene, since the camera is focused on his gun. However, upon closer inspection it is possible to see that he is being shot by somebody else who is at a different angle, too, likely Derrick.