Trevor Baker, 53, left ex-girlfriend Carolyn Kemp with an irreparable brain injury after he struck her in the head with a rubber mallet in 2009.
He confided in a neighbour that he was planning to give away the family pet, a Staffordshire bull terrier, and said of his ex-partner: 'I have got to kill her, she's got to go.'
During the attack, their son Callum, who was then four years old, heard a crashing sound and saw his father hitting his mother repeatedly over the head as hard as possible.
In an emotional statement in court, Callum Baker said: 'I witnessed the assault on my mother by my father.'
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