The worst part was that he could do nothing to end his suffering but wait.

Least I could do to reward him, end his suffering.

But he believes that only death can end his suffering.

Some were shot by German troops to end their suffering.

It would end so much suffering and uncertainty for them.

He said they had a pact to end his suffering.

Won't the victim concerned just make up anything to end their suffering?

Ned shot him in the chest to end his suffering.

But that was the only means available to end their suffering.

The best thing for the animals is to end their suffering.