Nadia Sharif, 17, is said to have died of strangulation at at West Lane Hospital, an NHS centre in Middlesbrough, Teesside, where she should have been supervised.
She, last Monday, became the second teenager to die there in the past two months after the tragedy of Christie Brayley.
And Nadia’s devastated family today told Teesside Live “something is going badly wrong at the hospital”.
Nadia had been an inpatient at the hospital for the past three months and was supposed to be supervised amid concerns she would harm herself.
But she managed to strangle herself in an isolation room, her father says. An inquest will be held at a later date.
“Something is going badly wrong at the hospital,” dad Hakeel Sharif said. “We have lost our daughter and we are worried for the families of other young people who are still in there.
“We were told that Nadia was on suicide watch, that she was being supervised 24 hours a day, which can’t have been the case for her to have been able to harm herself.”
The carer, from Middlesbrough, continued: “She was one of the patients whose treatment led to the staff being suspended over the way they were restraining and handling patients.
“There was CCTV footage of kids, including Nadia, being pulled by their legs.
“That led to 20 staff being suspended, but they have been replaced by agency workers who we don’t feel are correctly trained.
“The parents of other children who are in there are very worried. We have set up a Whatsapp group so that we can all communicate with each other about what is happening.