"Uh.  Not much data to work off of, unless you're a High Elf.  The last Summoned Hero died in a mutual wipeout with the Demon Lord.  I don't remember hearing much about what happened to the previous-previous Summoned Hero besides the slave collar thing.  Something something legendary monster got curbstomped(*) if I'm recalling correctly.  I guess I imagine they died of old age, because I'd be likely to hear about it if they'd died any ways more spectacular than that?"

(*) Lit. 'eaten like a grape'.

"Uh.  Not much data to work off of, unless you're a High Elf.  The last Summoned Hero died in a mutual wipeout with the Demon Lord.  I don't remember hearing much about what happened to the previous-previous Summoned Hero besides the slave collar thing.  Something something legendary monster got curbstomped(*) if I'm recalling correctly.  Er, I mean the monster got curbstomped(*), not the Summoned Hero.  I guess I imagine the Summoned Hero died of old age, because I'd be likely to hear about it if they'd died any ways more spectacular than that?"

(*) Lit. 'eaten like a grape'.