Lucy Letby suggested she could give “tips” to a colleague on how to get away with murder, a public inquiry has heard.

The child serial killer exchanged WhatsApp messages in 2017 with union rep Hayley Griffiths about the US legal drama How To Get Away With Murder.

The discussion took place a year after the neonatal nurse was moved to clerical duties at the Countess of Chester Hospital following concerns she may have been deliberately harming babies.

In a message to Letby, Ms Griffiths wrote: “I’m currently watching a programme called how to get away with murder. I’m learning some good tips.”

Letby replied: “I could have given you some tips x”

Ms Griffiths said: “I need someone to practice on to see if I can get away with it.”

Letby wrote: “I can think of two people you could practice on and will help you cover it up x”

Ms Griffiths replied: “Deal. I will get thinking of a plan. Get the cruise booked as our getaway.”

The pair were working in the hospital’s risk and patient safety department a year before Letby was arrested on suspicion of multiple murders by Cheshire Police.

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How the police caught Lucy Letby

Ms Griffiths said she was aware of the concerns of foul play and the connection to Letby by September 2016.

Shahram Sharghy, representing some of the families of Letby’s victims, asked: “Given the severity of the allegations that were made, and would you agree they are possibly the most serious allegations that anybody could make against a healthcare professional, were you making light of those allegations when you were referring to potentially committing a crime?”

Ms Griffiths answered: “No.”

Mr Sharghy asked: “Can you even begin to imagine and put yourself in the position of the families of the babies who were harmed when they see those messages?”

Ms Griffiths said: “I know… I am so remorseful. As soon as I saw them myself I was upset and I can’t begin to imagine… I can only apologise and say I have learned. I can’t go back in time but I have reflected absolutely on it.”

Read more from the inquiry:
‘Cold’ Lucy Letby failed final year student nurse placement
‘Breathing tubes dislodged’ during Letby shifts
Nurses who worked with Letby ‘were thinking the unthinkable’

Earlier, Ms Griffiths told counsel to the inquiry Rachel Langdale KC: “It was nothing more than a conversation. However, I truly and deeply regret having started that conservation… this is completely unprofessional, poor judgement on my behalf and completely insensitive. And for that, I can only apologise from the bottom of my heart.”

Letby, 34, from Hereford, is currently serving 15 whole-life orders.

She was convicted at Manchester Crown Court of murdering seven infants and attempting to murder six others between June 2015 and June 2016.

The Thirlwall Inquiry into the events surrounding her crimes is expected to sit until early 2015. The findings are expected by late autumn that year.