Christopher Duncan, 21, had the same tattoos as the rap star and had been performing his songs at a karaoke bar in London on the night of 13 May 2004.
Law student Jagdip Najran, 26, who had met him only two weeks before, left the bar with him, only to be battered over the head with an iron bat at his flat.
Duncan, 21, of Bethnal Green, east London, has pleaded guilty to murder.
He had been performing Eminem's songs, complete with dance moves, "aggressively" the night of the murder, the court heard.
"He went over to a group of women and called one of them a bitch," prosecutor Jonathan Laidlaw told the Old Bailey.
Meanwhile Ms Najran, who hoped to become a professional singer and had met Duncan at a karaoke night weeks before, told a friend she was excited at the thought of seeing him perform.
"She described him as a Scotsman called Chris who was an Eminem lookalike," Mr Laidlaw said.
"One of the tragic features of this case is the terrible misjudgement she made of him."
In fact Duncan was a petty criminal who drank and took drugs, and was said by doctors to have a personality disorder.
The pair left the bar and stopped off for a drink at another pub before heading back to Duncan's flat, where various weapons and violent videos were found.
But at some stage he battered her over the head with an iron baseball bat and stuffed her in a suitcase, where she remained alive for another hour, the court heard.
"His motive for this unprovoked and brutal killing of a defenceless and vulnerable woman, has not been established," said Mr Laidlaw.
"There is no sensible explanation for what he did."
Duncan fled to Blackpool, where he was later arrested.
He faces a life sentence, but judge David Paget remanded him in custody until Monday for sentencing, to consider the minimum term he should serve.
source: BBC NEWS
http://news.bbc.co.uk/2/hi/uk_news/engl ... 489056.stm
Here's what the guy looks like:
