YouTuber Emily Hartridge was riding an e-scooter too fast and with an under-inflated tyre when she was killed in a crash with a lorry, a coroner ruled.
The 35-year-old TV presenter and lifestyle guru died instantly following the horror collision in Battersea, south London, last July.
Ms Hartridge was on her way to a fertility clinic when she became the first Brit to have been involved in a fatal crash on the controversial electric-scooters.
Her grieving partner said “everything was going right” as the couple prepared to become parents before her tragic death.
An inquest concluded today at Westminster Coroner’s Court where the star’s death was found as accidental.
In notes seen by the BBC, Dr Fiona Wilcox, who presided over the inquest, said: “Ms Hartridge was riding an electric scooter on Queenstown Road when she lost control after passing over an inspector hatch in the cycle lane and was thrown under the path of an HGV.
“She died instantly of injuries sustained by the HGV driving over her.
“The scooter was being unsuitably driven, too fast and with an underinflated tyre and this caused the loss of control and her death.”
Ms Cartridge is thought to be the first person in the UK to be killed in a crash involving an e-scooter.
Her "10 Reasons Why" videos on sex, relationships, and mental health, had garnered more than 350,000 subscribers on YouTube.
According to the Department of Transport, e-scooters are classed as “powered transporters” and meet the legal definition of a “motor vehicle”.
Scooters must therefore meet a number of requirements in order to be used on roads, including insurance.
At the time of the fatal crash in November, e-scooters were illegal to ride other than on private land.
The vehicles were given the green light by the Department of Transport earlier this year, with supporters saying they will help reduce pollution.
But they remain controversial and the rules could change again after the current 12-month trial.
Jacob Hazell, Ms Hartdridge’s heartbroken partner, said previously that the pair were excited about becoming parents.
He described the YouTube star as being “most beautiful woman in the world”.
In a devastating interview, he recalled his sense of dread when the clinic said Ms Hartridge had failed to turn up to the appointment.
He told the Sun: “I am devastated. I got up first to leave home at 5am. I gave her a kiss on the lips. She was half asleep and mumbled, 'I love you'. I'm so pleased I did that.”
The personal trainer revealed some people have blamed him for his partner’s death as he bought her the scooter.
He said: “People have told me I'm to blame because I bought it for her, but I can't think that. Her family have told me I'm not.”
The grieving boyfriend also said the scooters should not be banned and the pair knew the risks and would wear helmets.
He added: “We had just moved in together and were planning a family. I'm heartbroken she has gone.
“I don't think they should be banned for adults, as they are electric, go a maximum of 20mph and don't do any harm to the environment."
Mr Hartridge paid tribute to his late partner in an Instagram post last week.
The emotional 28-year-old said: “I know Emily was the person who encouraged me to talk about how I was feeling I just want to put a video out here to say thank you and let people know I'm okay.
“I love you all and I love Emily and I appreciate the support, so thank you.”