Why did Henry killed his wife?

Answer 1

Two of the six wives of Henry VIII (1491 - 1547) were executed:

Anne Boleyn - Second wife of Henry VIII:

Anne Boleyn (c1501-07 - 1536), who displaced Catherine of Aragon in Henry's affections, had also been unfortunate enough not be able to provide Henry VIII with a male heir, which was not helped by the fact that she had a lot of jealous enemies at court. She was conveniently charged and subsequently executed on trumped up charges of adultery, incest, witchcraft - all treasonable offences. She was beheaded by an expert French swordsman, ordered by Henry as a more merciful death, on 19 May 1536 at the Tower of London. Ironically her triumph was that she was the mother of a great monarch, Elizabeth I.

Catherine Howard - Fifth wife of Henry VIII:

Catherine Howard (c1520 - 1542) was much younger than Henry VIII. She made the treasonable mistake of having an affair with a cousin of her mother's, Thomas Culpepper. When King Henry was given the details of her adultery, he is said to have cried, as he had always thought of Catherine as his "rose without a thorn". Catherine (a cousin of Anne Boleyn's) was beheaded on 13 February 1542 at the Tower of London, having asked for the block to be brought to her the night before, so that she could practice placing her head upon it.