Everything you stated, and have shown so far in the images, point to a dead Pinus flexilis
'Vanderwolf's Pyramid' that is now drying out. No new candles, and all needles browning, usually means no life is present.
Your first image shows a peculiarly striking difference in the bark of the trunk of the tree in the background. I'd want to see more of what is going on there.
White Pine Blister Rust is a killer disease that can infect this species, but I am not qualified to identify that. See here: https://www.fs.fed.us/rm/highe...
A search under White Pine Blister Rust will provide more horrible information than you will want to read.
You should step back and take a picture the WHOLE tree, and then take some additional images of the main trunk - especially around the base. It might also be helpful to show the context in which this tree is growing, and any activities that have occurred around your property in the vicinity of this tree in the past couple years.
If it is such an infectious disease as WPBR, you will be doing a huge favor to rid your neighborhood of this source as soon as possible. If it isn't, then the rest of your 5 needle pines will breathe a sigh of relief.
As I was about to hit Send, I thought of one other innocuous but deadly affliction of landscape plants. Sometimes, landscape contractors, nurserymen, or homeowners neglect to remove ALL non-organic materials from the rootball or base/trunk of the tree when it is planted. Eventually, any material like wiring, rope, twine, or non-organic wraps that encircle the trunk will become a noose to the growing tree. If your tree is dead, this will be something that is easy to determine when you remove the tree. If your tree is still fighting for life, then some exposure of the basal trunk area may uncover a culprit like this, but it won't be easy to find or fix as the tree has likely been trying to grow new wood and bark over the offending materials.
Show us more pictures, and tell us what you ultimately determine.