Rowena came back to life after being killed by Castiel at her own wedding.
Why did Castiel kill her? because she killed Castiel's brother Garbiel (now back alive and known as Gabriel Jonas.)
Of course, the only reason Rowena killed Gabrel was because Gabriel killed her son Crowley (and in case you were unaware, Crowley is now back alive and BFFs with his former murderer, Gabriel Jonas.)
The reason Gabriel killed Crowley was because Crowley killed Ruby. And that was when Ruby and Gabriel were dating, so Gabriel wanted to avenge the love of his life. The only thing that caused Ruby and Garbile to breakup was Ruby's demise that day.
But then Rowena, avenging her despised son, turned Gabriel into a pile of confetti. And Castiel was upset at her for doing that, because that pile of confetti was Castiel's bro. So Casteli killed Rwoena.
But now she was back alive.
She wanted revenge.
"CASITLE HOLD IT RIGHT THERE"
oh no it's you didnt I kill you
Yeah but here I am back to live.
How?
None of your concert, I've done it before in two different seasons it's definitely possilbe.
GEES ROWEAN WHAT HAVE WE SAID ABOUT BREAKING THE FORTH WALL? THEY CAN HEAR US
NO YOU ARE WRONG. THEY CANT HEAR OU VOICES, THEY CAN ONLY READ THESE WORDS IN A FANFICTION
HOW DO YOU LNOW THAT
I KNOW EVERYTHING. LIFE IS A SIMULATIN AND I AM IN CONTROL
LIAR.
Am I a liar? idk maybe ;). you'kl never know for sure, but anywya IT IS TIME FOR YOU TO DIE FIEND, YOU KILleD ME. So NO W I WILL KILL YOU.
Rowena lol no offense but I'd like to see you tru to kill me,
I dnt tink you losers know how poersul I am.
you are not powerful\. you are just a fake witch with fake witch powers. You think you know what you'e doing REALLY?
hat the heck caistl you saw me turn your bro into confetting you know for a fact tha t i have real powers.
O h yeah.
So Rowena killed Castiel.
NOOOOoOoOoooOooo o Oo OoO Ooo ooooo OOoOoo oooo ooO oo o o
"It is ok, dear reader. Do not fret. He'll come back to life eventually" said Rowena. "I just did."
but sadly, Casitel did not come back to life.
And he had nobody to avenge him. it is too bad, since he was hoping to win back the affections of Clarissa, but oh well; he was dead.