David Warren from Swindon witnessed yesterday's landslide in Dorset which killed 22-year-old Charlotte Blackman from Derbyshire.
After the first, smaller landslide, he tried to warn people to move away from the cliff.
"I got within 20-30 foot, the rocks were still falling and the Father and boyfriend were still, at that time, trying to dig the girl out, I said 'who's under there' and he said 'my daughter, my daughter.
"I said we can't do anything the rocks are too big, they were boulders really, you couldn't even more them by hand."
A memorial of a Derbyshire woman killed in a landslide in Dorset is to be unveiled.
The funeral of Charlotte Blackman from Derbyshire, who was killed in a landslide in Dorset took place yesterday.
Emotional tributes have been paid to 22-year-old Charlotte Blackman described as a ‘lively, fun-loving woman’