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Tear Jerker: Robots and Empire
When Baley dies. Daneel's reaction is decidedly human.
Ditto when Giskard dies.
The dying Baley refuses to let Daneel stay until his death, much as he would like to, for fear of the effect witnessing his 'Partner Elijah's' death might have on Daneel's First Law impressed positronic brain.
He also won't let Gladia see him on his deathbed, fearing her thoughts of him as a frail, dying old man.