Maybe you wont understand what i am saying now but if you havent found out yet i hope you can translate it or something, i personally think he didnt die because if you watched the movie that came out later then the season of servamp, lawless was still alive and i think there also was a clip in it where they talked about lawless necklace being broken so i think he is still alive, i am not sure tho! And the Movie is called "alice in the garden" if you dont know it! i am sorry tho if you cant translate it but its english btw💀i hope that you somehow can find out what i just said xD
Late reply but no, he didn't die. The manga is still on-going and he's still healthy. Although, it's a bit strange how Snow Lily is getting weaker while Hyde is perfectly fine. It's suspected that it has something to do with Licht himself and his bond with him.