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Investigation focuses on Houston’s behavior, prescriptions
(CNN) -- As plans for the weekend funeral of singer Whitney Houston took shape, investigators continued Thursday to look into the singer's prescription drugs and her actions in the days before her death. At New Hope Baptist Church, the Newark, New Jersey, house of worship where Houston sang as a child, preparations were under way for the private, invitation-only event on Saturday. Actor Kevin Costner, who starred with Houston in the 1992 hit movie "The Bodyguard," will speak at her funeral, according to a source with knowledge of the funeral plans.