Besteel was considered dead when he was dragged underground by a brood of sand-snipers.
Muthr tried to save Eva Nine from a blast from Besteel's boomrod by intercepting the shot. She thus got herself wrecked and soon was broken forever (deceased).
Eva Eight technically isn't dead. She just got turned into a tree during her encounter with The Mother at The Heart Of The Forest. She thus was frozen in the forest forever. She never appeared again in the storyline, though Eva Nine had a few mentions of her in the final book.