Two of the deaths, a brain trauma and a case of rheumatoid arthritis that worsened after treatment was stopped, are clearly not linked to the drug.

FORBES: Pfizer's Key Drug Walks A Tightrope

He said although householders who injure a burglar may not eventually be prosecuted they often faced "months of trauma" while a case was decided.

BBC: NEWS | UK | Chief backs right to defend home

Bob Paxman, a former SAS soldier who founded the PTSD charity Talking 2 Minds, said people reacted in different ways to trauma and Fitzsimons' case was an extreme one.

BBC: War horrors 'made our Danny ill'