An inquiry into Michael Jackson's death is now a criminal investigation, with manslaughter officially suspected by authorities.
No suspect has been named, but authorities have closed in on Conrad Murray, Jackson's personal doctor at the time of his death.
The Houston cardiologist, who was at Jackson's side tending to him when he died, has remained close to his Las Vegas home as authorities conducted searches of his Houston office and a storage unit, searching for evidence to explain the pop singer's sudden death at 50.