Brother 'can't recall his killing'.
Tony McCluskie said the last thing he remembered was grabbing his sister's wrists as she wielded a knife at him and threatened to stab him on March 1 last year.
The 35-year-old admits killing Miss McCluskie but denies murder, saying he has no recollection of what happened after he grabbed her.
Miss McCluskie's torso was found in a suitcase in the Regent's Canal in east London, followed by her limbs in plastic bags. Her head was found six months later.
The 29-year-old played Kerry Skinner in the BBC soap in 2001.
The trial continues today.