Dennis Nilsen in the new drama Des, which documented the killer's arrest and conviction.The three-part series started with Dennis being arrested for murder after killing at least 12 men between 1978 and 1983 in London.Viewers watched as Dennis went into detail about the murders, openly discussing the victims and listing them while showing no remorse.They flocked to Twitter just minutes into the show to share how sick they were feeling by David's convincing portrayal of the serial killer.One said: "It truly is a credit to David Tennant and how good an actor he is that his portrayal of Dennis Nilsen is actually making me feel sick."Another tweeted: "OMG I feel really sick, I might actually have nightmares tonight.
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