The segundo Robin is Jason Todd and he died a few years after becoming Robin. My guess is about 2014 because if it was any earlier the first Robin, Dick Grayson, wouldn't have been able to create the título Nightwing.
I'm going to guess you don't read comics, do you? Here's how it is in Young Justice. First Robin: Dick Grayson and is now Nightwing segundo Robin- Jason Todd, is now dead Third Robin- Tim Drake, is still currently Robin
Jason must have become Robin and died within the five ano time skip.
Just so you don't get confused if you here something different: In the actually DC comics Jason came back to life and is not quite evil but not good either, Tim moved on from being Robin to being independent (like Dick) and is going por Red Robin, and Damian Wayne is Robin.
The segundo Robin is Jason and he died after the Joker beat him with a crowbar and blew him up.... There was actually a phone pesquisa and the fãs voted to kill him off. He came bake to life later because of superman... Or the lazerus pit or somethin like that :/ then he became the red capuz, capa and killed a lot of people and eventually batman had to fight him. So yes, he died, but he's still alive to!XD
Jason was the segundo Robin. He died during the 5 ano break of young justice tv show. We never saw Jason play as Robin in the show because Joker killed him before he could come in as Robin in young justice so they had Tim be Robin.