Marion Edgington's body was found at home by her son Thomas
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The sister of a woman who went on the run after her mother was murdered has urged her to turn herself in to police.
Detectives named Nicola Edgington, 25, as their suspect in the fatal stabbing of divorcee Marion Edgington, aged 60, at her home in Forest Row, East Sussex.
They are searching an area of Woolwich, south-east London for Nicola.
Calling her a "chav", Sara Edgington appealed to her sister: "We cannot come to terms with what happened until we know where you are."
The office assistant from London begged: "Nicola, turn yourself in to the police".
'Perfect mother'
Ms Edgington's body was found by her son Thomas, 23, and Sara, 20, early on Saturday morning after they returned from a night out.
Mr Edgington called 999 from the semi-detached house in Upper Close, which his mother shared with her partner.
Det Ch Insp Adam Hibbert, leading the murder inquiry, said it was being treated as a domestic incident.
"It is now vital that we find Nicola. It is my intention that she will be arrested on suspicion of murder."
He said detectives were focusing on the events of Friday.
"These are integral to the final moments of Marion's life and as such I will not go into specific details."
Mr Hibbert said he was concerned for the welfare of Nicola, who is a married mother of two, but that her children were "safe".
Sara paid tribute to her mother, describing her as "perfect in every way".
Police search teams and a helicopter have scoured fields surrounding the house for any sign of Nicola.
She is described as 5ft 3in, with long fair hair and slim build.
Asked what her sister did for a living, Sara said: "Your guess is as good as mine.
"The only way to actually describe her would be a chav".