Dundee made three changes to the team with Jordan McGhee, Josh Mulligan and Scott Tiffoney came in for Cammy Kerr, Fin Robertson and Ryan Howley.
Kilmarnock started the better but Dundee looked quick on the break and began to come into the game after the first tenminutes.
On their second corner on 16 minutes they took the lead Owen Beck sent over a cross to the near post. Joe Shaughnessy headed on leaving Amadou Bakayoko with a simple close range finish at the far post.
Dundee looked much better and the second goal looked more likely with Beck twice unlucky with great play and efforts on goal.
It was a good game with both sides having good efforts on goal. Then Kilmarnock levelled the game after Var got involved with a penalty award after the ball hit Bakayoko on the arm. Armstrong scored from the spot.
More chances came for both sides as the game went end to end. The Dark Blues responded well but the match turned dramatically on a controversial refereeing decision after 34 minutes. Josh Mulligan attacked down the left but lost the ball on the edge of the penalty area. No foul was given and Mulligan stopped Killie breaking by bringing Armstrong down on the touchline. Mr Munro surprised almost every in the stadium by pulling out his red card. The message obviously came through from VAR central that he should review the decision. The referee took a good look and stood by the red card.
Robbie Deas got away with a two footed tackle studs first with just a yellow when it could have been a red if Josh's tackle was deemed to be one.
Second half and Fin Robertson came on for Scott Tiffoney at half time. That was harsh on Tiffoney who had a fine game until the red card disrupted the Dee. The change gave the Dark Blues a better balance and offered the defence more protection.
Killie were much on top with Dundee having to defend well and they still had a go when they could. Bakayoko had a good header saved but was ruled offside.
Killie had a good 10 minute spell and the got their second goal when Armstrong scored at the back post. It looked like the winning goal. But Dundee kept at it and Zak Rudeen turned well but not enough contact to trouble the keeper.
In injury time Trevor carson came up for a corner it did the trick when the ball was headed back into the goalmouth by Ricki lamie and Zak Rudden smashed the ball home to send Dens wild with delight.
It was a well deserved draw for Dundee who had fought well and came back from the the two var decisions went against us
Dundee: Carson, McGhee (Kerr 76), Shaughnessy (c), Lamie, Beck, Mulligan, Boateng, McCowan (Cameron 85), Robinson (Rudden 63), Bakayoko, Tiffoney (Robertson at half time). Unused Subs: Legzdins (gk), Pineda, Ashcroft, Sylla, Lewis.
Referee: David Munro
Att: 6,101