With Martin O'Neill's side trailing 2-1 against Norwich, the defender was handed a dream opportunity to level the match with half an hour to go.
Craig Gardner's thundering free kick rattled the Norwich crossbar and left Canaries goalkeeper Mark Bunn sprawled on the turf.
The ball fell straight to Kilgallon, who was on the edge of the six-yard with an open goal at his disposal.
Perhaps it was the pressure of the situation, perhaps it was the excitement of a first ever goal for Sunderland beckoning... but Kilgallon could only blast the ball into the stands.
With the ball more closer to entering orbit than the back of the net, the 28-year-old collapsed to the ground holding his face in shame.
Sunderland ended up losing 2-1 as their miserable run of form continued.
What do you think? Could your grandmother have tucked it away, or was the chance harder than it looked?