They might have died from hard training but other than that I'm not sure.
Yes, Brokentail did kill his apprentices in the "Warriors" book series by Erin Hunter. He is depicted as a ruthless leader who eliminates any threats to his power, even if they are his own followers.
Brokenstar (called Brokentail by ThunderClan, after the held him hostage) lost his last life when Yellowfang poisoned him with deathberries.
Because they would have found out sooner or later.
Brokentail killed over 32 cats in shadowclan, thunderclan, possibly riverclan. Look up on youtube, "Warriors:cats in starclan," You will see Much more cats that died.
Yes, when Bone, who was killed by many apprentices, from BloodClan, killed him.
Kit: Brokenkit Warrior-Apprentice: Brokenpaw Warrior: Brokentail Deputy: Brokentail Leader: Brokenstar Rogue: Brokenstar Prisoner: Brokentail MAIN: Brokenstar
There is nothing mention in the series about Brokentail ever having a mate and kits, and here is a source if u don't believe me...http://warriors.wikia.com/wiki/Brokentail
They killed each other. There was blood all over the place!
Brokentail murdered his father Raggedstar to become leader. He blames it on Yellowfang and sends her into exile. She then becomes medicine cat of Thunderclan. After Brokenstar gets driven out of his clan, he goes and attacks Thunderclan. Brokenstar goes after Yellowfang but Yellowfang cut his eyes, making him blind. Then, as a prisoner, Tigerclaws rouges attack Thunderclan with Brokentail attacking too. Then, after the battle, Yellowfang kills Brokentail, feeding him deathberries because he was to dangerous to have around anymore.
It is unknown if she has mentored any apprentices.
Fireheart's apprentices were Cinderpelt, Cloudtail, and Brambleclaw.
The Masters Apprentices ended in 1972.
The Masters Apprentices was created in 1965.
Yellowfang feeds him death berries and he loses his last life.