Michael Jackson's personal doctor has been named officially as the target of a manslaughter investigation

Michael Jackson's personal doctor has been named officially as the target of a manslaughter investigation into the singer's death.

A search warrant filed in a court in Houston, Texas, allows authorities to seek evidence of whether Dr Conrad Murray committed manslaughter.

Cardiologist Dr Murray was with the Thriller star, 50, when he died on June 25.

Los Angeles police and government drug agents used the warrant to seize items from Dr Murray's clinic in Houston on Wednesday.

The doctor's lawyer previously indicated authorities were seeking a manslaughter probe, but the warrant marks an official confirmation of the investigation.