Series of now-deleted posts appeared on Donald Trump Jr.'s Twitter account.
Posts included false announcement of father's passing and racial slur at President Joe Biden.
Posts were live for less than an hour before being deleted.
Trump Organization asserted the account was hacked.
Deleted posts contained alarming statements about North Korea, references to controversial figures, and mentions of individuals facing legal troubles.
Posts surfaced after 08:00 ET (12:00 GMT), raising questions about timing and execution.
Donald Trump Sr. made an unrelated post on his Truth Social account during the same period.
Donald Trump Jr.'s spokesperson confirmed the hack, stating "Don's account has been hacked."
Truth Social, Trump's platform after suspension from Twitter in 2021, remains Trump Jr.'s chosen medium for communication.
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