Peter Pettigrew gave up Lily and James' location to Voldemort, who then killed them. It wasn't actually Peter who preformed the curse that killed them, but his betrayal lead to it.
Voldemort killed Lily and James Potter.
Remus was killed by Dolohov and Tonks was killed by Bellatrix. JK Rowling herself said it in a web chat after The Deathly Hallows was released.
It is not known if Remus killed anybody, although it is fairly likely that he did as he was involved in many battles.
It's not specified in the series, but it can be assumed that they met through their involvement in the Order of the Phoenix during the second Wizarding war.
Tonks is killed by her aunt, Bellatrix Lestrange while Lupin is killed by Dolohov. :)
Lupin died first. He was killed by Dolhov and then Tonks was killed by Bellatrix before she could find her husband. :(
Remus Lupin was killed by Antonin Dolohov during the battle of Hogwarts. It is unknown what spell killed him.
Remus Lupin was killed by Antonin Dolohov, it was unknown what spell was used. Nymphadora Tonks was killed by Bellatrix Lestrange - her aunt.
A Death Eater named Antonin Dolohov.
Lord Voldemort.
Fenrir Graybeck
Remus Lupin, werewolf, teacher of Defense Against the Dark Arts in year 3, and member of the Order of the Phoenix (i.e., supporter of Dumbledore and the anti-Voldemort movement).
His name is Remus John Lupin so his initials are R.J.L.
Yes, she has a son named Ted Remus Lupin (named after Nymphadora's father and huband). Teddy inherits his mother's metamorphmagus skills.
No. Remus Lupin's death is not seen, and neither is his wife Nymphadora's. Harry sees their bodies in the Great Hall.
In the books, Remus Lupin never attacks or bites anyone. It is never mentioned that he tastes human flesh.
It is unknown where Remus Lupin lived.
Remus Lupin is #1 on my character selection. - Minerva MacGonagal
Remus John Lupin was born on March 10th, 1960.
It is unknown where Remus Lupin lived.
Fenrir Graybeck
No, she was in love with Remus Lupin.
Nymphadora Tonks and Remus Lupin had a son, Edward 'Teddy' Remus Lupin in 1998.
Remus Lupin, werewolf, teacher of Defense Against the Dark Arts in year 3, and member of the Order of the Phoenix (i.e., supporter of Dumbledore and the anti-Voldemort movement).
Remus Lupin died on the 2nd May 1998 during the battle of Hogwarts. He was killed by Antonin Dolohov.
"Remus Lupin" can be arranged to "Primus Lune," which means "full moon."
His name is Remus John Lupin so his initials are R.J.L.