LONDON, England --It was one of the most notorious acts of assassination carried ... was killed by poison dart filled with ricin and fired from an umbrella in London in 1978.

Jason Kale Clampit, 44, was sentenced for possession of ricin, which he had made to set traps for trespassers, prosecutors said. By Johnny Diaz An Arkansas man who produced jars of the lethal ...

Ricin made international headlines when a communist agent killed a defector to the West using a poison-tipped umbrella on a bridge in London in 1978. Georgi Markov, a novelist and playwright, defected ...

LONDON, England (CNN)-- British detectives have launched a fresh probe into the umbrella assassination of Bulgarian ... an umbrella filled with the toxin ricin in September 1978.