Luke, chapters 19 & 20

“In fact, neither can they die anymore, for they are like the angels, and they are God’s children by being children of the resurrection.”
~Luke 20:36

While Jesus was asked about the earthly resurrection, his answer seems to apply to the heavenly resurrection, a new concept to his audience.
The earthly resurrection will be in the flesh, much like that of Lazarus or the little girl he rose from the dead. (Luke 8:53-55; John 12:9-11)
But here Jesus speaks of a spiritual resurrection, likening those resurrected to angels.
This begs the question: can angels not die?
In order to die, Jesus had to leave his angelic body and become a man.
When he was born again as a spirit, death no longer had power over him. (Rom. 6:9)
God’s Word never refers to angels as being immortal, the way faithful anointed servants hope to be. (1 Co. 15:53)
Nor does the Bible ever mention the death of an angel.
As my husband pointed out, it is only fallen angels, or rather, demons, who await God’s judgment. (2 Pet. 2:4; Jude 6)
I personally would like further insight into this topic, but it is clear angels who remain faithful to God cannot die.

Ezekiel, chapters 32-34

“​For this is what the Sovereign Lord Jehovah says:’Here I am, and I myself will search for my sheep, and I will care for them.'”
~Ezekiel 34:11

As time proceeds deeper into the “last days,” Jehovah God actively looks for those who have strayed from the flock. (John 10:16; 2 Tim. 3:1-5)
Although Jehovah’s Witnesses’ worldwide preaching work is primarily aimed at witnessing to non-believers, from time to time we run into a stray sheep who for one reason or another has seized associating with the congregation.
Because our work is headed by angels, we are able to find repentant brothers and sisters who recognize the times we are living in and ask for help to return to Jehovah before it is too late. (Zep. 2:2,3; Rev. 14:6,7)
It is an undeserved honor to be allowed to collaborate with our kind heavenly Father in this soul saving work. (1 Cor. 3:9)