Part One of 24 Hours in Police Custody: Murder on Prescription aired on Channel 4 last night, showing a behind the scenes look at the police's work to catch Eliza Bibby's killer.

Eliza Bibby was found dead in her Wisbech bungalow in January 2013 with fatal stab wounds to her neck. 

Part One of the hit Channel 4 show opened with footage of Cambridgeshire Police officers visiting Eliza Bibby's mother, Christine, to inform her that her daughter has been killed. Christine's screams echoed into the introduction of the episode.

The programme offers a unique behind the scenes look at the immediate aftermath of Eliza's murder. Cambridgeshire Police officers mentioned that Eliza was a victim of a burglary in 2018, but that was all that they had on their record.

Police officers at Eliza Bibby's bungalow after she was murdered.Police officers at Eliza Bibby's bungalow after she was murdered. (Image: Cambridgeshire Police)

Body-cam footage showed Eliza's carer attempting to visit her the morning after her murder. The carer, shocked to find out that she was killed, said that Eliza was an "innocent soul".

The perspective then switched to the Major Crimes Unit who investigated the scene. The officers questioned how Eliza's body was brought into the kitchen.

It later emerged, after officers spoke to her neighbours, that Eliza Bibby dealt drugs from her property in an open-door policy. 

Cambridgeshire Police officers then identified two individuals, Mark and Katie Coleman, as potential suspects in the murder. DI Dale Mepstead said that the pair's names had been "brought up by a lot of people".

The siblings had both been arrested and brought into custody for unrelated offences but were later questioned about Eliza's murder. Both Mark and Katie responded with "no comment" to questions relating to the murder.

Officers discovered that the morning after Eliza's murder, Mark Coleman was stopped by officers in the street and found to have a brooch on him. Footage shows DI Mepstead's team work to see if the brooch has any connection to Eliza Bibby.

However, officers take the brooch to Christine's house and she does not recognise it as having belonged to her daughter. Neither Mark or Katie Coleman were charged with Eliza Bibby's murder.

Mark Coleman told camera crews: "To murder a woman you’d have to pay me millions."

DI Mepstead's team later receive a call saying that Mark Coleman died in his prison cell at HMP Peterborough.

Cambridgeshire Police officers continued working through several leads and spoke with a man who they believed was the last person to have seen Eliza Bibby alive prior to her murder. 

The force also identified a car belonging to a member of the Bibby family entering Wisbech on the night of her murder. It later emerged that Eliza had spoken with this family member the night was killed, saying she would "cut them off".

The end of the episode showed this family member being arrested, with Christine saying it was "devastating".

Part Two airs tonight (September 10) on Channel 4 at 9pm.