There are currently 49 criminals serving whole life terms in English prisons, and David Cameron has vowed to ensure that "life means life" for the worst offences.
Those serving full life terms include Jamie Reynolds, who pleaded guilty to the murder of Shropshire teenager Georgia Williams last year.
Mark Bridger, who was jailed for killing five-year-old April Jones, is also serving a whole life sentence.
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The Labour leader has called the Norwich South MP's remark "completely unacceptable" and says Clive Lewis has personally apologised to him.
Jamie Harron, was arrested in July over the incident in which he said he put his hand on a man's hip to avoid spilling a drink in a bar.
An English woman has died and four other people have been injured in a boat accident on the River Rhone in southern France.