Rediff reports that the Jamaican police received a tip-off that the coach was poisoned by aconite, the perfect drug to mask a murder. Read the full article Aconite used to murder Woolmer: Report
What is Aconite?
In Greek and Roman mythology, Medea tried to kill Theseus by poisoning him by putting aconite in his wine, thought to be the saliva of Cerberus, the three-headed dog who guarded the Underworld. Hercules dragged Cerberus up from the Underworld, while the dog turned his face away from the light, barking and depositing saliva along the path. The saliva hardened in the soil and produced its lethal poison in the plants that grew from the soil. Because it was formed and grew on hard stones, farmers called it 'aconite' (from the Greek akone, meaning 'whetstone'). (From wikipedia)