Here are some well-known trees that have succumbed to nature or otherwise.  Most are casualties of fires.

Puzzle Corner Tree in Giant Forest

The Millikan Tree on the Cal Tech part of Nelder Grove burned in the 2017 Railroad Fire

Perseverance Tree in Black Mountain, pictures from 2017 and 2019

The Pioneer Cabin Tree in Calaveras fell in 2017.

Dogwood Meadow Double Tree in Mountain Home

King David in McIntyre burned badly in the Castle Fire in 2020

Bent Tree in McIntyre perished in the Castle Fire in 2020

Near Gutless in McIntyre perished in the Castle Fire in 2020

Gutless Goliath in McIntyre perished in the Castle Fire in 2020

Loren's Tree in Freeman Creek perished in the Castle Fire in 2020

Rattler Tree in Freeman Creek perished in the Castle Fire in 2020

Ride-through Tree in Freeman Creek perished in the Castle Fire in 2020

Telescope Tree near Goshawk perished in the Castle Fire in 2020

 
Perhaps one of the most shocking Castle Fire victims was the Bonsai Tree in Mountain Home.  The fire occurred and killed it in late 2020.  We first saw the damage to it in june 2021, however when i visited it on a bright sunny day in june t appeared to be an extinguished skeleton of a former tree.  We saw no hint of smoke during our visit to it in june.  It was not out however, it was apparently still on fire, tho i sensed no hint of it.  It continued to burn internally until over a full year after the fire and be consumed slowly.  A year after the fire in late 2021 it was seen to be still burning when a limb dropped off it with active flames and let in more air to continue to consume its standing bole. 

Below are 3 pics from about the same angle of it, taken before the 2020 fire, the second taken more than half a year after the fire, (june of 2021) and then the third from over a year later after when it was finally burned out.  As you can see, by a half a year after the fire, it was a blackened but still 200 foot tall skeleton.  However by a year after the fire, it is was further consumed to the point of becoming less than a hundred foot tall hollowed out snag.  It is possible for a sequoia to burn naturally from a fire for over a year after the initial fire started.

The Packsaddle Giant burned in the Windy Fire in 2021. Pics on the left are before the fire and pics on the right are after.