Dozens of families have contacted ITV London over the treatment of their loved ones at Basildon Hospital.
The hospital is one of 14 across the country currently under investigation, because of higher than expected death rates.
The probe by the NHS Commissioning Board was ordered in the wake of failings at Stafford Hospital, where neglect and abuse led to hundreds of unnecessary deaths.
For this special report, Paul Brand spoke to two families, who claim the deaths of their relatives following treatment at Basildon Hospital could have been prevented.
More top news
Kelly Kepple told police she was paid £65 a week to hide the deadly weapon that she chose to store near where the youngster slept.
Two groups of men can be seen brandishing huge knives at each other during a late-night showdown on a deserted street.
These three wheelchair users have three separate stories about how London's bus network lets them down.