Aristocrat Constance Marten and her partner Mark Gordon have been convicted of the gross negligence manslaughter of their newborn baby.
Marten, 38, and Gordon, 51, went on the run with daughter Victoria in early 2023 after their four other children were taken into care.
Police had launched a nationwide hunt after their car burst into flames on the motorway near Bolton, Greater Manchester.
The couple travelled across England and went off-grid, sleeping in a tent on the South Downs where baby Victoria died.
After seven weeks on the run, the defendants were arrested in Brighton, East Sussex.
Following a desperate search, police found their baby dead amid rubbish inside a Lidl bag in a disused shed nearby.
Victoria’s remains were too badly decomposed to establish the cause of death.
The prosecution said she died from hypothermia in the cold and damp conditions inside the flimsy tent or was smothered.
The defendants claimed their daughter’s death was a tragic accident after Marten fell asleep on her.
A jury in their retrial found Marten and Gordon unanimously guilty of manslaughter on Monday.
In their first trial last year, the defendants were convicted of perverting the course of justice, concealing the birth of a child and child cruelty.
Detective Superintendent Lewis Basford of Scotland Yard, said: “Today, the justice we have long fought for has been finally been served for baby Victoria.
“The selfish actions of Mark Gordon and Constance Marten resulted in the death of a newborn baby who should have had the rest of her life ahead of her.”
The senior officer said Victoria’s death was “completely avoidable” as the defendant had plenty of opportunities to “do the right thing” and ask for help.
In light of the conviction, the family court decision to take Marten’s four other children into care was “shown to be right”, he said.
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