Feathertail, Runningnose, Hawkfrost, Sootfur, Cinderpelt(reincarnated), Molekit, Ferntail's kits except for Birchfall, an apprentice that fell during the journey, Tallstar, mudclaw, shrewpaw, frostfur speckletail dappletail and other elders stay behind, mudfur, and those are just some that I can remember.
Leopardstar dies in Fading Echoes
Yes, Foxleap dies in the Warriors series. He dies in the battle against the Dark Forest.
Honeyfern. but Holly leaf also "dies" though shes still alive hollyleaf does Hollyleaf doesn't die. Just Honeyfern.
In the book "Sunrise" of the Warriors series, Hollyleaf dies after being trapped in a tunnel collapse. She sacrifices herself to save Ivypool and Dovepaw.
Yes, he does. Feathertail dies trying to save The Tribe of Rushing Water and her Clanmates, along with Crowfeather, the cat she loved. -Bluestar127
If the leader dies in the warrior book series, the deputy would take over. Like, when Bluestar dies--Fireheart was the deputy--Fireheart would take over the leadership of the Clan.
Heavystep, a ThunderClan warrior in the Warriors series, dies twice in different books: once in a battle against ShadowClan in the original series and then again in a battle against the badgers in the later series.
Yes, she dies in The Forest of Secrets, which is the first book of the first series, bearing Graystripe's kits.
Scourge dies in the 6th book of the Original Arc 'The Darkest Hour'.
Darkstripe dies before he can have a mate in book 6 the darkest hour. He died in the battle of Bloodclan killed by Graystripe
Sandstorm dies in the Warriors series in the book "The Last Hope" during the battle against the Dark Forest. She sacrifices herself to save Firestar from a fatal attack.
Honeypaw dies from Greencough, a fatal sickness that affects cats, in the Warriors series by Erin Hunter.