NICOLA Bulley's Fitbit was still recording movement for eight days after she disappeared, an inquest heard.
The mum-of-two, 45, was last seen in St Michael’s on Wyre, Lancashire, on January 27.
Nicola's disappearance sparked a social media frenzy as ghouls descended on the village to solve the mystery.
Tragically, her body was found in the river on February 19 – three weeks after she vanished.
A full inquest into her death was told it is likely Nicola fell into the River Wyre from a "cliff-edge drop".
Once in the water, she travelled at a "metre a second" downstream in the "steady flow" of the river.
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Her Fitbit watch and Mercedes car keys were discovered three weeks later when her Nicola's body was recovered.
The watch had stopped recording Nicola's steps at 9.30am on the day she disappeared.
DC Keith Greenhalgh said that due to analysis of her iPhone and Fitbit watch data, she “very possibly” entered the water at 9.22am.
A heart rate output was still given eight days after she died drowned before it lost power on February 4.
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DC Greenhalgh said this possibly "could be a result of the movement of water passing between the device and Nicola’s wrist".
He added: "Testing on inanimate objects provided similar results when there was a movement in the water.”
The inquest into Nicola's death opened yesterday at Preston's County Hall in front of partner Paul Ansell, sister Louise Cunningham and parents Ernest and Dot Bulley.
The family wept as they heard harrowing details of the mum's final moments.
Home Office pathologist Dr Alison Armour, who carried out a post mortem on Nicola, gave her cause of death as drowning.
The expert said she believed Nicola was alive when she entered the water and confirmed there was no sign she had been assaulted before her death and no indication of third party involvement.
Dr Armour also confirmed Nicola had not been drinking before her death and had "therapeutic levels" of a beta blocker in her system.
The court was told the water was just 4C when Nicola vanished, which could lead to cold water shock and cause a person's muscles to seize up.
Diving expert Professor Mike Tipton said she would have lost consciousness almost instantly.
He also suggested she would have drowned in "one or two breaths" due to her size and the temperature of the water.
Tragically, Professor Tipton said she would have died "in less than minutes".
Footage has been released by police of a diver recreating Nicola's final moments in the river.
PC Matthew Thackray from the North West Police Underwater Search & Marine Unit, showed him swimming in a “fairly buoyant suit” as he measured the current of the water.
The specialist cop filmed from where Nicola’s phone was discovered to where her body was found.
Mortgage adviser Nicola vanished without a trace after dropping her two daughters, aged six and nine, off at school.
Her disappearance gripped the nation after it was revealed her mobile was found on a bench by the river still connected to a work conference call.
Nicola's pet springer spaniel Willow was also discovered – but there was no trace still of the mum-of-two.
During the search, Lancashire Police refused to waiver from their "main working hypothesis" that she fell in the river.
But Nicola's family including partner Paul said they did not believe the theory and urged people to continue searching.
They also hired dive expert Peter Faulding, who used £50,000 sonar equipment to scour the water.
He later pulled out of the hunt, saying he did not believe Nicola was in the river as she could have "stood up" if she fell in.
Pressure is now mounting on Lancashire Police over Nicola's disappearance after a series of blunders during the probe.
The mum's body was found by two dog walkers less than a mile from where she was last seen despite a "hugely complex and highly emotional" search.
The force also came under fire for disclosing painfully personal details of Nicola's struggle with alcohol and the perimenopause.
They confirmed she had "vulnerabilities" at the time she went missing and was a high-risk missing person.
Home Secretary Suella Braverman and Prime Minister Rishi Sunak were among officials questioning why the information was revealed.
The police watchdog also launched a probe into a "welfare check" carried out at Nicola's home just 17 days before she vanished.
An independent review is also being carried out over the force's handling of the case after being ordered by Lancashire's Police and Crime Commissioner Andrew Snowden.
The inquest continues.
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