London, July 20 - Pop legend Michael Jackson's siblings are convinced that he was murdered. While sister La Toya says she knows the group who 'killed' her superstar sibling, brother Tito claims that Jacko's personal doctor is prominent among the list of suspects.

Tito, 55, said Jackson could still be alive today had Conrad Murray called for help as soon as he realised the stricken singer was in serious trouble.

'My opinion is that he panicked when my brother didn't wake up. I think the doctor probably figured there could be trouble, he tried to revive Michael. He did have a pulse but he couldn't bring him back,' thesun.co.uk quoted Tito as saying.

'I don't know what the time lapse was between the doctor finding him and when he called paramedics. I believe if he had immediately called for help we might still have my brother here today -- he would definitely still be alive. I think he (Murray) is a suspect. But suspected of exactly what? I don't know,' he added.

Tito, who performed with Michael in the Jackson 5, said he found it strange that the medic tried to revive Jackson, who died June 25, on an unsuitable soft bed.

'That's one of the things I noticed that was very strange and odd. I don't know very much about the doctor. I don't know his practice, his capabilities, anything like that -- apart from the fact he was Michael's personal doctor at the time. He has passed the whole thing on to his lawyers. I imagine he is protecting himself,' said Tito who was speaking to a Spanish TV show after jetting to Alicante for a concert.

Asked if he thought it was possible his brother was murdered, Tito said: 'Anything is possible.'

Jackson's sibling alleges a number of people apart from Murray took advantage of the singer and killed him to gain control of his music publishing catalogue, which La Toya claims is worth more than $1 billion, reported contactmusic.