The killer of `` Harry Potter And The Half-Blood Prince actor jailed for life , must serve at least 20 years . Karl Bishop , last May , attacked Rob Knox with 2 knives in southeast Britain at least 20 years . to get this message across and help stamp out knife crime and get weapons off our streets . '' Knife crime in London is political hot topic due to spate of recent killings .
The killer of `` Harry Potter And The Half-Blood Prince actor jailed for life , must serve at least 20 years . Karl Bishop , last May , attacked Rob Knox with 2 knives in southeast Britain at least 20 years . Knife crime in London is political hot topic due to spate of recent killings .