Do these pictures prove it WAS a penalty for Liverpool's Christian Benteke at Crystal Palace?

Christian Benteke converted a controversial penalty he had won in the last minute of stoppage time to help Liverpool to a 2-1 win at Crystal Palace

Reuters / Eddie Keogh

Silenced: Christian Benteke celebrates scoring his last minute penalty

Liverpool came from behind to beat Crystal Palace in controversial circumstances at Selhurst Park, with Alan Pardew fuming at the penalty awarded to the Reds in the final seconds.
The Palace boss accused Christian Benteke of diving after he went down under a challenge from Damien Delaney in the final seconds of the game.
After consulting with his linesman Andre Marriner eventually pointed to the spot, and substitute Benteke got up to fire home and earn all three points for Jurgen Klopp's side , who had found themselves a goal and a man down before Roberto Firmino equalised.
Jamie Carragher suggested after the match that Marriner had made the right decision, but Pardew was having none of it as he slammed the decision which means his side are now 12 Premier League games without a win.
"He certainly made a meal of it - if it had have been us we would not have got it," he told Sky Sports. "We've had it all year. We've had penalties with Wilf (Zaha) and not got them."
But did Marriner make the right decision?

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Benteke runs with the ball into the area...

Sky Sports

But is he caught by Damien Delaney?

Sky Sports

This image appears to show Delaney's knee make contact with Benteke's heel

These pictures appear to show Delaney's sliding knee making contact with Benteke as the Belgian striker goes past him in the penalty area.
Having won the spot kick he made no mistake in sending Alex McCarthy the wrong way as Liverpool hit back after James Milner's second half sending off.