

What's wrong with this tree and should it be removed?
Location is central Maryland, just north of Washington DC. I think this is some sort of ornamental cherry? It had tons of white/pink flowers when it was healthy. It was planted by the home builder about 25 years ago. A couple years ago it started dying and I have no idea what caused it. It's technically not mine, it's just across the property line by only about 18 inches. What's causing it to die? Should it be removed or is there something that can be done to help it recover? I can provide more pics if needed.