There appears to be no word on the reason for the move. There may or may not be some by the end of the day. The bereavement list is used when a player has a serious illness or death in the family. The player is allowed to miss from three to seven games.
Worth was batting .176 with OPS of .476 when he was last with the Tigers. With the Mud Hens this season, Worth is batting .306 with .941 OPS in 83 plate appearances.