Witnesses told local media that the elk was also charging at other golf carts on the Evergreen Golf Course.
The bear chased the male elk into the Yellowstone River before killing it and dragging it to the bank.
The unidentified man was photographed following a male elk off the trail despite calls from bystanders to stop.
Colorado Parks and Wildlife also shared footage of elk running through the morning fog.
The website Hunter Nation described the president's son as "the modern-day Teddy Roosevelt."
Only game that's been "accidentally struck" can be consumed as meat. So drivers can't intentionally mow down a wild animal for fast food.
The fisherman said he believed the antlers and a lower jawbone that was discovered in 2014 belonged to the same animal.
The woman sustained serious injuries after the elk appeared to try to protect its calf.
The fires that raged after the accident have stopped burning, but questions remain about oil and rail safety in a region known for toxic spills.