Park ranger Margaret Anderson, 34, was fatally shot in Washington's Mount Rainier National Park on Sunday.
Four to five feet of snow is on the ground, including about two feet of fresh powder, where the gunman escaped.
"There's a lot of snow on the ground, (and) it would be difficult to move through quickly," Taylor told CNN. "And it's heavily forested."
Manhunt launched at Mount Rainier after park ranger killed - CNN.com