Benjamin Roach from Plymouth has been jailed for seven years for causing the death of his one-month-old daughter Roxie.
Roach had denied killing Roxie in September 2010, but was found guilty at Plymouth Crown Court yesterday.
Medical experts told the court that Roxie's injuries were so severe they could have been the result of a car crash.
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Police are urging any witnesses to get in touch after a schoolboy had his jaw broken in an unprovoked assault.