Casualty's David Hide makes discovery in Ollie death aftermath

Casualty spoilers follow.

Casualty's David Hide is looking for answers on what led to his son's death in this Saturday's (July 16) episode, leading to him making a horrifying discovery.

David hurriedly carries an unopened evidence box into his new flat, desperate to not be recognised by the other residents. However, before he can open the box he recieves a threatening phone call that sets off his paranoia.

Things only get worse for David as an explosion tears through the block of flats immediately after.

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The explosion puts David into nurse mode and, with the help of fellow resident Callum, he helps to save several of the injured residents inside the building.

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The paramedics soon arrive and Callum reassures David that the residents will always have his back. However, when Jan's suggests that the explosion could potentially have happened because someone tampered with the gas, David admits he's worried the explosion may actually have been targeted at him.

Later on, David returns to the building to collect some things, including the evidence box, but sees Callum searching for Lyra's dog before collapsing in pain inside the building.

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Despite the dangers, David and Jan follow him in to help – only for the building to fall down around them. The pair struggle to stabilise Callum as the fire service attempt to then save them from their own immediate danger.

As Callum's health starts to worsen, David is forced to perform an emergency tracheotomy to save his life. Overwhelmed with emotion, David opens up to Jan, who reassures him that hes not to blame for what Ollie did.

They're rushed back to the hospital where Jan loses consciousness. Callum then reveals to a worried David that the explosion wasn't his fault, admitting that it was him who messed with the gas meter because he was trying to help Joyce be able to pay her energy bills.

BBC

Later on, David finally gets to open the evidence box and finds some happy memories of a young Ollie. He then opens one of the notebooks and is horrified by what he sees.

But what has David found out?

Casualty airs on Saturdays on BBC One and streams on BBC iPlayer.