From A Wiki of Ice and Fire
|Title||Lord of Highgarden Warden of the South|
|Book(s)||A Storm of Swords (Mentioned)|
Lord Luthor Tyrell, Lord of Highgarden, Warden of the South, was the former head of House Tyrell. He was the grandson of Lord Leo Tyrell. He is the father of the current lord, Mace Tyrell. He rode off a cliff to his death while hawking. He had been looking up and not paying attention to where his horse was going.