Kevin Conroy's death is devastating for anyone who grew up with Batman. The Animated Series will probably always be the platonic ideal of Batman. It's sharp, smart, funny, and takes the character seriously (while not being overly serious). One of the ways it did that was by really taking the time to care about the voice performances, and Kevin Conroy was the standard bearer of that. He wrote a comic called Finding Batman earlier this year about his struggle as a young gay actor during the AIDS crisis and how he turned that pain into his performance, and it really shows in the work.
There are a million moments from that show that are jumping to my mind right now (Bruce begging his parents forgiveness in Mask of the Phantasm, his instantly iconic "I am vengeance, I am the night" monologue from "Fear Itself", pretty much all of "Beware The Grey Ghost") but what is jumping to me the most right now is "Epilogue" from Justice League Unlimited. In the episode, which really is a goodbye to the character from every incarnation of the DCAU, he comforts Ace, a superpowered girl who also had her childhood taken from her. It's everything that is great about his incarnation of the character.
I hope he found peace in the end. He's a hero.