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.
One of the families claiming the death of their relative following treatment at Basildon Hospital could have been prevented is Lorraine Linder's.
Lorraine's family claim her death was preventable, she was diagnosed with lung cancer, the tumour spread to her spine and she died within weeks.
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A 24-year-old man has been arrested on suspicion of murder after the body washed up on the Thames shoreline.
Seven people have now been arrested after a man died from serious head injuries
The 38-year-old officer was on his way home from a night shift when he collapsed. His death is not being treated as suspicious.