Ardora Luthor

Ardora was a native of the planet Lexor who met Lex Luthor as he was traveling through the universe, and she fell in love with him and they are married, and the have a son named Lex Luthor, Jr.

She is eventually killed along with all the rest of the natives of Lexor when a terrible disaster destroys the planet.

Reference
Super Powers (Volume One)
 * Super Powers Vol 1 1