A Yellowstone National Park tourist met a grisly demise when he wandered off the boardwalk and fell into a boiling, acidic spring.

“No significant human remains were left to recover after Colin Nathaniel Scott, a former nature preserve volunteer from Portland, Oregon, went off a designated pathway and slipped on some gravel and into the water in a geyser basin dotted with boiling hot springs,” ABC 7 reports.

Scott walked about 225 yards off the boardwalk with his sister, which was a violation of park regulations. They wanted a closer look at the spring in Norris Geyser Basin.

His sister was the only witness to the incident.

She alerted park rangers who looked “for hours,” only to find “a few bits and pieces of clothing and other personal effects,” The Ranger reports — but no Scott.

As Yellowstone park public relations officer Charissa Reid said, “there was nothing left to recover.”

“We extend our sympathy to the Scott family,” park superintendent Dan Wenk said in a news release. “This tragic event must remind all of us to follow the regulations and stay on boardwalks when visiting Yellowstone’s geyser basins.”