An investigation into whether actor Brad Pitt was abusive towards his son in September has ended with no finding of wrongdoing. Social workers in Los Angeles had been examining claims that Mr Pitt had hit his 15-year-old son Maddox on a private jet. His wife Angelina Jolie filed for divorce the day after the incident. They had been married for two years, but together for more than a decade. Mr Pitt is seeking joint custody of their six children. Jolie cited filed to end the marriage on September 19.