It looked as though the Reds had lost some crucial ground to leaders Manchester City.
The Merseyside derby had somehow approached its conclusion without a goal for either side.
Xherdan Shaqiri threatened early on for Liverpool, while Everton’s best chance came via Andre Gomes, who was denied a goal by the duo of Alisson and Joe Gomez.
The near-certainty of a deadlock made what happened next all the more dramatic.
A Trent Alexander-Arnold cross deep in injury time found Virgil van Dijk at the edge of the box, which wasn’t ideal. The centre back completely sliced his attempted volley and turned away in disgust at blowing his chance for glory.
As he did so, the ball was sailing just over the bar, and while the Liverpool forwards couldn’t reach it, Everton keeper Jordan Pickford inexplicably touched it back into play, perhaps trying to catch it for a quick counter attack.
It hit off the bar, and Origi, who was the only person at Anfield who hadn’t given up on it, won the ball and headed it home to thundering scenes.
Liverpool stay two points behind Manchester City in the table. While it’s an early Christmas present for the Reds, it ultimately came via the sheer doggedness of a certain Belgian.