In 2011 two men were arrested in England for plotting to rob and murder pop star Joss Stone.

According to a report in The Telegraph, the men, Junior Bradshaw and Kevin Liverpool, have been convicted on conspiracy to to cause grievous bodily harm and conspiracy to rob. Liverpool has been sentenced to life in prison, and will serve a minimum of 10 years and eight months. Bradshaw’s sentencing was postponed.

According to the Telegraph report, the pair were found near the singer’s home with a “samurai sword” and knives. At one point the criminals asked a mailman for directions to Stone’s house. The amateur criminals were reported to have had notes outlining a plot to behead Stone and dump her body in a river.

The motive for the men’s plot isn’t entirely clear, though notes written by the men contained references to the British Royal family. The writings referred to the fact that Stone had been invited to the Prince William’s wedding in 2011. The men also mentioned Eminem, Beyonce, R. Kelly and Chris Brown.

Stone’s mother addressed the media after the convictions, thanking supporters on her daughter’s behalf and expressing relief that the men are behind bars.