A BUNGLING hitman who murdered an innocent dad has a €10,000 price on his head behind bars.

Associates of crime boss Jay O’Connor will pay the cash to any inmate who whacks evil killer Christopher McDonald in Dublin’s Mountjoy Prison.

4 Christopher McDonald has a €10,000 bounty on his head

4 The last ever picture of murder victim Keith Walker

Contract killer McDonald was locked up in July after shooting Keith Walker 18 times outside the Blanchardstown Pigeon Racing Club, in west Dublin, in a case of mistaken identity.

He shot the dad-of-two — who had no involvement in crime — in the mistaken belief he was his pigeon-racing pal O’Connor.

This is the first time a price has been placed on McDonald’s head — despite Dublin gang boss O’Connor telling us there “would be war in this f***ing town” after the killing.

A source told the Irish Sun: “McDonald has no support in prison and there are many inmates who have a close association with O’Connor and his gang.

“The concern is that some ­desperate addict in prison may target McDonald in return for ­having some cash waiting for him when he gets out.

“McDonald was recruited by the gang because he was also an addict and has just been left alone now with absolutely no support.”

4 Crime boss Jay O'Connor

The Irish Prison Service refused to comment on the sinister threat, adding: “We do not comment on individual cases.”

But McDonald, 34, could be moved to another jail as part of prison policy.

Once a prisoner is subjected to a threat, the lag is immediately removed from the ­general jail population while the situation is assessed by bosses.

And as McDonald begins the first months of his life sentence, the Irish Sun today reveals the last image of the innocent victim.

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Our exclusive snap shows Keith getting into the driver’s seat of O’Connor’s car before leaving for the pigeon club.

Just an hour later, the popular man was gunned down and an innocent taxi driver was also blasted in the leg by McDonald, who was on his first kill mission.

Hated McDonald was dressed as a woman when he hit Keith, 36, with 16 rounds in the body and two in the head on June 12, 2015.

4 Keith Walker was shot 18 times outside Blanchardstown Pigeon Racing Club

The assassin — who wore a ladies sports top, leggings and a wig — was also clutching a ­handbag that he used to carry his Makarov ­sub-machine gun for the broad daylight attack.

We previously revealed CCTV showing McDonald walking through a supermarket car park minutes after the murder.

McDonald ­— a member of the gang at war with rapist Christy Griffin’s mob in Dublin’s north inner city — approached Keith and shouted “Jay O’Connor” in a bid to confirm his intended target’s ID.

A source said: “Keith was a devoted family man and the only reason he was killed is because he happened to borrow Jay O’Connor’s car that day.

“He only knew O’Connor through pigeon racing and yet this has ended up costing him his life.

“He didn’t stand a chance when ­McDonald opened fire that day.

“It’s a miracle no one else was killed that day.”