A man from Germany has been jailed for life for stabbing a Nottingham student 86 times after stalking his girlfriend.

一位来自德国的男子被判终身监禁，他用刀刺一个诺丁汉学生86次。

Heiss became angry when his obsessive¹ messages were blocked

David Heiss, 21, from Limburg, became infatuated（入迷的） with 20-year-old Matthew Pyke's girlfriend Joanna Witton, 21, during repeated internet exchanges.

Heiss, who denied the murder charge and said he was acting² in self defence, was found guilty at Nottingham Crown Court.

The judge described Heiss's motive³ as "bizarre（奇异的）" and ordered him to serve at least 18 years for the 2008 attack.

During the trial the jury heard that on 18 September, 2008, Heiss flew from Frankfurt to Birmingham with a knife and made his way to the flat Mr Pyke shared with Miss Witton on North Sherwood Street in Nottingham.

He waited until Miss Witton left for work the following morning and confronted Mr Pyke, originally from Stowmarket in Suffolk.

Heiss had claimed he was acting in self defence after Mr Pyke charged at him with a knife.

The court heard Miss Witton, who was originally from Selby in North Yorkshire, met Heiss through a website she ran with Mr Pyke.

Heiss spent six months pestering⁴（烦恼，苦恼） her with declarations of love and visited the couple twice in Nottingham before the attack.

He became infuriated（激怒的） when the couple, who conducted their entire social life online, blocked Heiss from their website, preventing him from sending further messages to Miss Witton.