On this day in sports: April 7

1. 1943 The National Football League makes helmets mandatory. Source
2. 1968 Two-time Formula One British World Champion Jim Clark dies in an accident during a Formula Two race in Hockenheim. Source
3. 2015 Died: José Capellán, Dominican-American baseball player (born 1981) Source
4. 2024 Died: Jerry Grote, American baseball player (born 1942) Source
5. 2025 Died: Greg Millen, Canadian ice hockey player and sportscaster (born 1957) Source

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From Wikipedia's "On this day" feed via the Wikimedia API (CC BY-SA). The text is Wikipedia's, filtered to sports items. Nothing was added.