Aconite used to mask Woolmer's murder: Report

 Aconite causes the victim's internal organs to seize and slows down their breathing until they finally stop. Death is usually by asphyxiation within 30 minutes and this explains how 16-stone Woolmer died without putting up a fight.

"The aconite tip is a major breakthrough and is being taken extremely seriously. The man who called Kingston police station had a Pakistani accent and was very specific about aconite and how it was administered," Shields was quoted as saying by the paper.

"The symptoms Bob suffered before he died are identical to aconite poisoning, which is why it is a major line of inquiry now. It would also explain how such a physically imposing man, at 6ft 1in tall, died without putting up a fight. You'd struggle to get two people into his bath room let alone three, so it could be no-one was there," he added.

Toxicologists say aconite is the "perfect" drug to mask a murder. It also explains why Jamaican pathologist Dr Ere Seshaiah found no marks around his neck to suggest he had been strangled.