CONVICTED killer Mark Hobson may launch an appeal against his "life-means-life" prison sentence.

The shaven-headed murderer, who killed four people in his crazed attacks, was given a sentence that meant he will die behind bars.

But his legal team has revealed that it is looking at challenging that ruling in the courts.

Last summer, Hobson murdered twin sisters Claire and Diane Sanderson at Camblesforth, near Selby, North Yorkshire, and pensioners James and Joan Britton.

Only weeks ago, Mr Justice Grigson gave him four life sentences and said: "On each count life must mean life."

It is thought to have been the first time a life-means-life sentence had ever been imposed on someone who pleaded guilty.

Yesterday, Hobson's solicitor Keith Haggerty confirmed that the possibility of an appeal against the sentence was being "actively considered" but declined to give details.

Relatives of his reacted with anger and disgust.

The twins' father, George Sanderson, said at his home in East Cowick: "It would be an insult to both families. If there's any justice at all, he should never be let out.

"Hobson is a monster and the only way he should come out of prison is in a box."