A large scale search and rescue operation was launched between Dancing Ledge and Hedbury Head on the Dorset coast.
A group of people got into difficult into the water around 3.30pm on Sunday.
Coastguard rescue teams, RNLI lifeboats, the coastguard helicopter, paramedics and cops all rushed to the scene.
Dorset Police confirmed this morning that a man in his 40s was pronounced dead on the clifftop after his body was recovered by lifeboat crews.
Eight others were rescued from the water and treated by paramedics.
A Coastguard spokesman said: “It is believed the casualties got into difficulty while coasteering and it was reported that they had lifejackets on.
“Eight people were recovered from the water by the lifeboat and a ninth casualty was recovered to the clifftop by two of the inshore lifeboat crew.
“In total twelve casualties, including three instructors, were taken to the nearby boathouse for medical assessment.”
This is a breaking news story and is constantly being updated.
Please refresh the page regularly to get the latest updates.
Reporters working on dailystar.co.uk will be working to source the latest information, reaction, pictures and video related to this story.
You can also follow us on Twitter @Daily_Star to get the latest news updates 24 hours a day.
Or download the Daily Star app for flash alerts on the biggest stories of the day.