Oxford United chairman Ian Lenagan said the club had "thought long and hard about whether to employ a player with his [Luke McCormick's] background."
He added that McCormick's "clear repentance and the opportunity to allow him to rehabilitate whilst meeting our unique goalkeeping situation within the Salary Cap - which we might otherwise not have been able to do - resulted in our decision to sign him".
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A post-mortem examination 'has not identified any injuries to suggest any other person was involved', Dorset police said.