Dobby was killed when Bellatrix Lestrange threw her silver knife at him as he disapparated from Malfoy Manor. Harry buried him at Shell Cottage.
Bellatrix Lestrange.
Yes he is.
Saves peoples' lifes then gets killed by Bellatrix Lestrange.
Dobby died in Harry Potter and the Deathly Hallows.
Bellatrix kills him in Harry Potter and the Deathly Hallows
No, Dobby does not return. He gets killed by Bellatrix Lestrange in the Deathly Hallows.
Dobby's age was never mentioned in the series.
Dobby and Kreacher.
Yes he was nice because he saves Harry in the Deathly Hallows
When Dobby dies. The chapter entitled: "The Forest Again"
When Dobby helped Harry Potter and his friends escape from the Malfoy Manor. He died at Shell Cottage, due to Bellatrix Lestrange's knife going through his chest.
"Dobby didn't mean to kill anyone. Dobby only meant to maim or seriously injure"