Tony McCluskie, 35, said he suffered loss of control leading to her death on March 1.
She went missing after attending the opening of the new Royal London Hospital.
Her limbless body was seen floating in the water a week later.
The brother of former EastEnders actress Gemma McCluskie, who was found dead in a canal, has pled guilty to her manslaughter.
Tony McCluskie, 35, said he suffered loss of control leading to her death on March 1.
She went missing after attending the opening of the new Royal London Hospital.
Her limbless body was seen floating in the water a week later.
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