We have had tons of rain this year. No problem with not getting enough water. How could this happen within a week?

Winter cold damage. Tree fails when it turns hot.

So it can leaf out and be okay for awhile, and then suddenly die when it turns hot? So sad. It was such a pretty tree.

inspect the trunk and make sure you don't see any borer wholes. ambrosia beetle can kill a tree quickly. Sometime trees can die and you never find out why. I had plum tree died all of a sudden after it produced a large crop of fruit that same year.

bacterial canker will kill tree if canker girdles trunk

As a commercial cherry grower. We expect to lose trees. Every year we lose some trees. We have young trees that look great in the fall, then the following spring they will push out and then die. Often can't tell why. We just to joke that all you had to do was look at a cherry tree the wrong way and it would die