Struggling to breathe and mouthing 'help me' at a video camera in front of his bed, the deeply distressing footage of Steve Carr's agonising final moments haunt his family.

Upstairs, a nurse, who was meant to be monitoring the video feed in case his breathing tube became blocked during the night, failed to respond – even though it is understood that an emergency alarm sounded loudly for more than 40 minutes.

By the time she finally came to his aid, it was too late. Steve, 67, who had motor neurone disease (MND), had passed away in the most appalling of circumstances.

The Mail on Sunday can reveal that Steve's horrifying ordeal has been investigated by the police for more than two years but there have been no charges.

Shockingly, it is claimed the nurse is seen on the video apparently attempting to unblock his airway around 20 minutes after telling his wife that she believed he had passed away, which his family fear may have been an attempt to cover up how he died.