at the end of Forest of secrets book 3 in the first ark
He used to be, but then Tigerstar was revealed for what he was, and Longtail remained loyal to ThunderClan.
I dont know exactl y which page because it's been a long time since I have read it but I know it happens near the end when Fireheart is about to go see Princess he sees Tigerclaw and his band of rouges going towards Thunderclan camp. Tigerclaw tries to kill Bluestar but Fireheart stops him then after all the rouges are chased off with the help of Riverclan Bluestar exiles Tigerclaw and at the end of the fourth book Tigerclaw becomes Tigerstar. I am on Starlight in the new prophecy so ask any questions and I will answer them.
Yes, he was ThunderClan deputy to Bluestar between Redtail and Tigerstar.
TigerClan.
ThunderClan Rogue ShadowClan TigerClan (Modern)
No he became leader of ShadowClan.
Partially, yes. Tigerstar was exiled for turning on his own Clan. This includes his murder of Redtail, but also, perhaps more significantly, his recruiting of rogues to attack ThunderClan and his plot to murder Bluestar. If he had not attacked Bluestar, giving Fireheart the opportunity to reveal the full extent of his betrayal, Redtail's murder may have remained a secret for many moons more.
Tigerstar killed Runningwind as part of a plan to weaken ThunderClan and provoke conflict between the clans. He wanted to assert his dominance and show his power as a threat to those who opposed him. Runningwind's death was a deliberate act of violence to further Tigerstar's own ambitions and control over the forest.
He killed many cats without guilt, tried to kill his leader in thunderclan, tried to kill ALL of Thunderclan
Tigerstar's Father is Pinestar. It says it in Bluestar's Quest and Cats of the Clans.
The best ThunderClan warrior ever would probably be Lionblaze. He is part of the prophecy "There will be three, kin of your kin, who hold the power of stars in their paws." Lionblaze's grandfather, Tigerstar, is considered by many to be the greatest warrior to live. I know Tigerstar was leader of ShadowClan, but he was in ThunderClan for Into the Wild, Fire and Ice, and Forest of Secrets.
She isn't told, but she over hears Tigerheart and Tigerstar talking. It reviles that Tigerstar had been lying to her. He was not helping thunderclan.