Colin Nathaniel Scott, 23, fell into the spring in the Norris Geyser Basin area of the park in north-west Wyoming.
Held had her daughter and niece take video and pictures of the group as they walked across a hot spring.
Today, rangers will focus their efforts on recovering the body.
Norris Geyser Basin is open, but visitors should expect occasional temporary closures until rangers finish the investigation.
Officials say an OR man has died after leaving a boardwalk in a geyser basin at Yellowstone National Park and falling into a hot spring.
Down through the decades there have been relatively few deaths in the park's hot springs, just 22, according to park records.
The Yellowstone National Park visitor who was presumed dead after he fell into the Norris Geyser Basin was identified Wednesday as an OR resident.
Authorities are now trying to retrieve Mr Scott's body from the spring but have so far been unable to reach it.
".hot springs deaths have ocurred much more commonly in Yellowstone National Park than have grizzly bear deaths", Yellowstone historian Lee Whittlesey writes in his book, Death In Yellowstone, Accidents and Foolhardiness in the First National Park.
Rangers are treating the incident, which occurred 225 yards off the boardwalk, as a "probable fatality", according to a statement from the park.
Park officials say Mr Scott and his sister had strayed some 200 metres (656ft) from a designated walkway. On Saturday a father and son suffered burns in the Upper Geyser Basin near Old Faithful after walking off a designated trail in the thermal area.
Other recent tourist incidents at Yellowstone include a 13-year-old boy who got burned days ago when his father, who had been carrying him, slipped into a different hot spring.