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A few months after the Dominion's founding, Alpha Squadron was dispatched to Char in order to "flush out" the zerg. Alpha Squadron was on the receiving end of the casualties however, a receiving end which included the zerg overrunning the science vessel Amerigo. In response, a demolition team, Jacobs included, was sent to investigate and, if any zerg were present, destroy it.
The marines had brought a high yield explosive with them, along with a number of beverages. While enjoying such a substance along with his teammates, Jacobs was suddenly impaled by a hydralisk's claw from behind, piercing his skull. Seconds later, his corpse was lifted up and away from his teammates.
A marine named Jacobs appeared in the StarCraft beta. Like the one that appeared in the cinematic, he is identifiable by a name painted on the lapel region of his armor. Jacobs appeared again in artwork commemorating StarCraft's 15th anniversary.
Based on the text printed on his helmet, it appears that this version of Jacobs possessed an O blood type.