Picked out by Mrs Palme at a lineup as the killer, Pettersson was tried and convicted of the murder, but was later acquitted on appeal to the court of appeal. Pettersson's appeal succeeded for three main reasons:  Additional evidence against Pettersson surfaced in the late 1990s, mostly coming from various petty criminals who altered their stories but also from a confession made by Pettersson. The chief prosecutor, Agneta Blidberg, considered re-opening the case, but acknowledged that a confession alone would not be sufficient, saying:  While the legal case against Pettersson therefore remains closed, the police file on the investigation cannot be closed until both murder weapon and murderer are found. Christer Pettersson died on 29 September 2004, after suffering a cerebral haemorrhage caused by a fall during an epileptic seizure. According to a documentary programme broadcast on Swedish state television channel SVT in February 2006, associates of Pettersson claimed that he had confessed to them his role in the murder, but with the explanation that it was a case of mistaken identity. Allegedly, Pettersson had intended to kill Sigvard Cedergren, a drug dealer who customarily walked along the same street at night and resembled Palme both in appearance and dress. The programme also suggested there was greater police awareness than previously acknowledged because of surveillance of drug activity in the area. The police had several officers in apartments and cars along those few blocks of Sveavägen but, 45 minutes before the murder, the police monitoring ceased. In the light of these revelations, Swedish police undertook to review Palme's case and Pettersson's role. In the newspaper "Dagens Nyheter" of 28 February 2006, other SVT reporters scathingly criticized the documentary, alleging that the film-maker had fabricated a number of statements while omitting other contradictory evidence, in particular his chief source's earlier testimony that could not be reconciled with his claim to have seen the shooting. In the final part of the investigation, and the end report, Pettersson was not much included due to formal legal reasons. The police is according to law not allowed to reopen an investigation of a person found not guilty in trial, unless major new evidence happen to materialise. Enough such new evidence has not come up, so the investigation was after the trial not focused on him, and the final report instead pointed out the "Skandia man" with even less evidence. On 21 February 1986 — a week before he was murdered — Palme made the keynote address to the "Swedish People's Parliament Against Apartheid" held in Stockholm, attended by hundreds of anti-apartheid sympathizers as well as leaders and officials from the ANC and the Anti-Apartheid Movement such as Oliver Tambo.