Giving fans an insight into her husband's state, Kate, 53, looked emotional in the film, as she looked on at a video of Derek, also 53, on her phone, as he lay in a hospital bed.
In a first clip for her new ITV documentary, Finding Derek, which airs later this month, Good Morning Britain star Kate says: "Derek is the sickest person the team of doctors have treated that's lived."
"Is he going to be able to come back or will he be alive but no longer the person he was before?"
The screen then fades to black, and the message sombrely reads: "One year later, Derek is still in hospital."
Derek was placed in a coma on April 5th last year, in the hope it would help him defeat the virus.
While Derek hasn't had Covid since summer, the disease ravaged his body, leaving him with kidney failure, damage to his liver and pancreas and heart failure.
The former Labour lobbyist also has holes in his lungs as a result of his battle with bacterial pneumonia and several other infections. Plus, he's lost a staggering eight stone in weight.
Doctors have since stopped the drugs that were keeping him in a coma - even causing him to open his eyes - but he remains in a state of minimal consciousness.
A synopsis for the documentary reads: "As Derek, who was hospitalised in March 2020 with the virus, remains in hospital with severe health issues, Kate also meets survivors of the disease and discusses the somewhat unknown, longer-term effects of the virus.
"As Kate lays bare in the film, her family, along with many others who have suffered the effects of the virus, is now facing the reality of adjusting to a very different way of life to the one they lived before the pandemic hit."
Speaking in a recent Times interview, Kate - who has children Darcy, 14 and Billy, 11 with Derek - elaborated on her husband of 16-years' condition, and discussed the heartbreaking fact he is "unlikely" to ever make a full recovery.
To give some idea of how bad his condition is, doctors told her there is a chance he could make enough of a recovery to one day "hold a hairbrush".
"The very worst moment was when they said he could be locked in for ever. And I just thought, this is a horror story," she said.
"I don't know if he'll ever have any kind of life again. We just don't know. The change in his body is shocking."
Kate Garraway: Finding Derek airs later this month on ITV.
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