tree on its way out?

[Ollie_M]

got a tree at the end of my garden - no clue what it is really but i have a feeling its dying as it was the first tree to loose its leaves around us last year by about a month, it was then the first tree to put leaves on this year - canopy started off well but it has thinned with time, not massively but it has.
got some pics of a couple lower branches, that i trimmed the heartwood looks weird to me and all of them had pinholes in the center.
just wondering what people think, it poses no danger and ill quite happily fell it if needed.
thanks.

 

Edited May 12 by Ollie_M

[Mick Dempsey]

It’s a poplar.

Doesn’t look too bad.

Wait and see.