Police charged the step-son of Kevin Francis with murder late last night.
But they released a 49-year-old woman without charge.
Rachid Riahi, who lived at the house with his mother Julia and Mr Francis, was arrested at their home in Hurtwood Road on Tuesday shortly after 9pm.
Mr Francis died of a stab wound to the chest, a post-mortem examination confirmed.
Mr Riahi will appear at Staines Magistrates' Court this morning.
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