As first reported by 670 The Score, a relative and three friends of Castro were killed in a car accident in his native Dominican Republic. Castro has left Chicago to return to the Dominican.
Castro can remain on the bereavement list for a maximum of seven days, and must be on for a minimum of three days.
The 24-year-old is hitting .284 with a .762 OPS this season, and his 13 home runs are one short of his career high. Castro was named to his third All-Star Game in July.
Infielder Logan Watkins was recalled from Triple A Iowa to take Castro's place on the roster. Watkins was hitting .256 with a .693 OPS for Iowa. In Castro's absence, second baseman Javier Baez will move to shortstop, and either Watkins or utility man Chris Valaika could play at second.
- Ben Estes