snape particpated in the battle of hogwarts and was killed by lord volodmort because snape was rumored to be the true master of the elder wand and like dumbledore when he killed had a portait of him in his office they decided to do the same for snape
Voldemort killed Snape.
Severus Snape
Snape comes back, but then dies.
Harry Potter and the Deathly Hallows Part 2.
Yes
Severus Snape was headmaster in book seven: Harry Potter and the Deathly Hallows.
no he is in love with her but they never kiss.
No, I don't think so.
I seriously doubt it, because Snape's parents aren't in Deathly Hallows, not even in a flashback. Snape's parents appear only once in the series, when Harry breaks into Snape's mind in Order of the Phoenix and sees some of Snape's childhood memories. And that's only in the book, not the movie.
I believe you mean Snape, as in Severus Snape. Yes, he was good. Harry finds it out after Snape's death in Deathly Hallows.
Yes. Alan Rickman reprised his role of Severus Snape in both part of Harry Potter and the Deathly Hallows.
Severus Snape