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Who assassinated William I in Delft in 1584?

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Portrait of William I, Prince of Orange, by Adriaen Thomasz Key. He wears a dark embroidered coat, a white ruff collar, and a black cap, with a trimmed beard and mustache. — William I Portrait of William I, oil on panel by Adriaen Thomaszoon Key, c. 1579; in the Rijksmuseum, Amsterdam.

William I, Prince of Orange, was assassinated on July 10, 1584, in Delft by Balthasar Gérard.12

Gérard was a fanatical young Roman Catholic from Franche-Comté who was motivated by the promises of a reward offered under the ban of Philip II, the King of Spain, who had outlawed the prince in 1580. William was shot at his residence, the Prinsenhof, and was later buried in the New Church in Delft.1324