Two-point attempt from Rory Beggan, but it's narrowly wide .

Conor Doherty gets his name on the scoresheet. Once again, Derry are in front.

Monaghan are level again through Dessie Ward. His first score of the game - what a time to get it!

A two-pointer for Lachlan Murray and Derry retake the lead.

John McGovern
BBC Sport NI at the Athletic Grounds

Extra time is underway and Monaghan have made an immediate impact, with Bobby McCaul winning their first throw-in of the game.

Captain Michael Bannigan then keeps his composure to convert a free and put the Farney men ahead for the first time this evening.

Has the momentum now swung in Monaghan’s favour?

Micheal Bannigan sends over a free to give Monaghan the lead incredibly for the first time in the game.

The teams are back out for extra time and we're off again here.

Who's going to the final?

A crazy, crazy end to the first Ulster Championship semi-final.

Derry kicked 14 wides throughout but still had Monaghan at arm's length for much of the second half.

Huge credit to Gabriel Bannigan's side and to Jack McCarron especially, with that game-tying score.

Absolutely superb score with the outside of his left foot from the sideline.

Rory Beggan played a big role in making referee Noel Mooney realise that he had made a mistake ending the game before Monaghan took the sideline ball.

The debate is now whether McCarron stepped over the line or not.

John McGovern
BBC Sport NI at the Athletic Grounds

Extraordinary scenes in Armagh.

Jack McCarron keeps his cool to convert the two-point sideline with the final kick of the game, after a lengthy delay to clear the pitch.

Everyone inside the Athletic Grounds is still trying to process those closing moments, but there’s little time to dwell — a place in the final remains up for grabs.

My word he has nailed it. Jack McCarron sends his two-pointer from the sideline between the sticks and we are heading for extra-time.

John McGovern
BBC Sport NI at the Athletic Grounds

Monaghan have produced an outstanding second-half comeback, but the hooter has sounded and the game has been called — much to the frustration of the Farney supporters.

There’s major controversy here now, with a free set to be awarded, but the pitch has already been stormed.

Scenes of real confusion at the Athletic Grounds as the sideline ball has been given.

Wait, referee Noel Mooney has ordered the game to be restarted at the side-line.

Derry hold on.

A Jack McCarron free reduces the gap to two.

Derry have just kicked their 14th wide. Despite their wastefulness, it didn't seem like it would cost them, but it may now with Monaghan resurgent.

John McGovern
BBC Sport NI at the Athletic Grounds

Only three points separate the sides now and this game has well and truly ignited with five minutes remaining.

Rory Beggan has been outstanding in this half — landing a pair of two-point frees and now providing a crucial assist for Michael Bannigan to convert.

Rory Beggan wins the kickout and finds Micheal Bannigan. He rounds the keeper and finishes to the net - the Monaghan comeback is on!

Game on!

Shane McGuigan gets another to settle Derry nerves even further.

John McGovern
BBC Sport NI at the Athletic Grounds

Only five points between the sides now as the Farney men throw everything at Derry with 10 minutes remaining.

Five two-pointers have fuelled comeback hopes, but they may rue Bobby McCaul’s saved effort, a moment that had the stands holding their breath.

Lachlan Murray doing his best to halt the Monaghan momentum as he gets his fourth point of the day.