During sentencing, Mr Justice Goss said that Hall had “maintained the fiction” that he had not hurt Ms Henshaw.
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He said: “Having heard all the evidence, I am satisfied that there were earlier occasions in your relationship where you were violent to Sarah Henshaw and bruised her.
“Whatever arose that caused you to be violent in the bedroom, you attacked her and, although it could not be established by pathological evidence, you almost certainly strangled her.
“You then set about hastily doing what you could to prevent your crime being discovered.
“Consequently, you made mistakes which enabled careful detective work to reveal what you had done.”
He added: “I can’t accept that you have genuine remorse for killing her, as you still protest you did nothing to hurt her.
“I accept that there was no pre-meditation and you had no intention to kill, but you clearly ignored her screams and used sufficient force to cause her death.”
Hall had previously told the court that Ms Henshaw died after falling down the stairs but admitted to dumping her body in the lay-by as he “just panicked”.
Defence KC Andrew Vout submitted that Hall “deeply regretted and was very sorry for” dumping Ms Henshaw’s body, and called the defendant’s actions as “plainly very wrong”.