Emmerdale spoilers: Robert bears witness as psycho John kills Aaron!

Robert finds John and Aaron.

Emmerdale's Robert Sugden tries to save Aaron from John but is it too late in Monday's episode? (ITV, 7.30pm, see our TV Guide for full listings).

Having sussed that his husband John is a psycho, Aaron Dingle wants out. And he wants to find his missing best mate. Mack, who he thinks is trapped somewhere in the woods.

As Aaron tries to break free of John's clutches, Robert's not far behind on a mission to save his ex from his nutter brother.

Is Robert about to witness Aaron's murder at the hands of secret killer John? (Image credit: ITV)

Having got John's mum's address from Pollard, Robert tears over to the cottage where a bitter confrontation blows up.

Finding Aaron gone, Robert lays into John, accusing him of murder.

Defiant, the killer paramedic floors Robert with a sucker punch. After checking he's still breathing, John legs it after his runaway husband.

Robert tracks down John having got his mum's address from Pollard (Image credit: ITV)

When Robert accuses John of murder, things turn physical (Image credit: ITV)

Robert punches John… (Image credit: ITV)

… but it's Robert who ends up knocked out cold by his psycho brother John (Image credit: ITV)

As Aaron claws his way through the woods, trying to work out where Mack could be, he comes to a dead end when his search takes him to a huge gorge.

John then looms into view, covered in blood. Aaron doesn't believe a word of his explanation and as John unravels, he realises just how unhinged his husband is.

Urging John to tell him where he can find Mack, Aaron's making headway when Robert turns up and turns John's unease on its head.

Turning on Aaron, furious John rants and raves. Not about to let Robert have Aaron, John then calls the police – spinning a story to frame Robert – before leaping off the cliff with Aaron in his arms…

Aaron has twigged that John is unhinged and is trying to escape (Image credit: ITV)

John tries to talk round Aaron who is desperate to get his husband to tell him where he can find Mack (Image credit: ITV)

John isn't about to let Aaron and Robert reconcile (Image credit: ITV)

But when Robert rocks up, John flies into a rage. After making a call to the police to frame Robert, John grabs Aaron and jumps from the top of a cliff… (Image credit: ITV)

In the shop, Paddy shares his concerns about John with Victoria.

Paddy and Victoria discuss their concerns about John's welfare (Image credit: ITV)

Emmerdale is on Monday, Wednesday, Thursday and Friday this week from 7.30pm on ITV. See our TV Guide for full listings to find out when you can catch the soap on ITV and ITVX.