The mother of a man who plunged to his death at a party Pete Doherty was at is demanding to see police papers into their investigation.

After a meeting with the Crown Prosecution Service yesterday, Sheila Blanco found out that Doherty, his minder Johnny Jeannevol and writer Paul Roundhill will not face charges over the death of her son Mark at a party in Romford Street, Whitechapel in December 2006.

Mr Blanco was said to have had a confrontation with the Babyshambles singer before falling off the first floor flat balcony but the Crown Prosecution Service said there was not enough evidence to take the case to court.

Ms Blanco has vowed she’s “will not stop” in her fight to find out exactly what happened and today told the Advertiser she is taking the rare step of requesting the details behind the investigation.

She said: “We are going to get hold of some of the information including the police paperwork. Nobody’s seen it and we don’t know what it contains.

“We have been told a certain amount about the investigation but it’s not detailed.

“We are not stopping. That’s definitive.”

After spending �60,000 on her own investigation into her son’s death, Ms Blanco is now considering whether to move forward with a private prosecution.

Jenny Hopkins, from the CPS, said yesterday: “None of the evidence is capable of establishing to the required standard that Mr Blanco was thrown or pushed from the balcony or that any other individual was present at the time he fell.”