Sister gave killer a false alibi

Mr Monckton was repeatedly stabbed at his home

The sister of the man who murdered City banker John Monckton gave him a false alibi, a court heard.

Laura Campbell said her half-brother Damien Hanson was with her at a friend's flat when Mr Monckton was stabbed to death in London in 2004.

But her friend told police she lied. Campbell, 20, of Fulham, admitted perverting the course of justice. She will be sentenced next month.

Hanson was jailed for life for stabbing Mr Monckton during a raid on his home.

He received three life sentences and was warned he could expect to serve a minimum 36 years.

Black diary

His drug dealing accomplice, Elliott White, 24, received 18 years for his role in the attacks.

The banker's wife Homeyra was seriously hurt during the raid which was witnesses by their young daughter.

The prosecution said the case against Campbell, who was remanded in custody after the hearing, partly centred on a black diary found in her bedroom.

Parmjit Cheema, prosecuting, said: "Inside were some notes which had the appearance of prompt cards, which would remind her of the story she would have to tell with the relevant detail.

'Serious offences'

"This shows the level of planning and sophistication this plan had and the preparation for giving evidence in court."

Campbell pleaded guilty at London's Blackfriars Crown Court to two counts of perverting the course of justice and one of perjury.

Withdrawing her bail and remanding her in custody, Judge Charles Byers warned her that prison was inevitable for the "serious offences" she had committed.

Furthermore, the term she would have to serve would be of "some length".

Campbell will be sentenced on 24 November.