Pine Tree Dying
We viewed your photos but there was not enough information to make a diagnosis. When trees are subject to drought, soil compaction, too much moisture, poor drainage, planting too deeply, root problems, etc. they are susceptible to insect and disease problems.
Dead or dying trees should be removed. For an onsite diagnosis regarding the health of the tree, contact several certified arborists for the best way to proceed .http://www.treesaregood.org/
See our pine publication for more information and signs and symptoms http://extension.umd.edu/sites/default/files/_images/programs/hgic/Publications/HG54_IPM_Series_Pine...