calcium. and now i don't know if it's making me sick. >> the jury would get a lesson in poisoning, the court was told that cyanide isn't something you buy over the counter. the little stuff, according to this poison expert, is available only a mouse click away online. >> there is a study done where they actually looked at ebay. there is two times when it came up, that you can buy on ebay site, cyanide. and it turns to be a snap to shake up the calcium in the capsule, and replaced with cyanide. >> you can just take a pen cap, and you can scoop it with that, and pour it right in. >> that may have been the killers methodology. but in the big picture, the most damning factor against diaz, because his decision to flee. but an innocent father of left his two children behind, just weeks after their mother had died. for the story, the courtroom was taken to the middle east, to account for yaz missing months in lebanon. this man, we jamal --