Michael Jackson has died

We've just learned Michael Jackson has died. He was 50.

Michael suffered a cardiac arrest earlier this afternoon at his Holmby Hills home and paramedics were unable to revive him. We're told when paramedics arrived Jackson had no pulse and they never got a pulse back.

A source tells us Jackson was dead when paramedics arrived. A cardiologist at UCLA tells TMZ Jackson died of cardiac arrest.

Once at the hospital, the staff tried to resuscitate him but he was completely unresponsive.

We're told one of the staff members at Jackson's home called 911.

La Toya ran in the hospital sobbing after Jackson was pronounced dead.

Michael is survived by three children: Michael Joseph Jackson, Jr., Paris Michael Katherine Jackson and Prince "Blanket" Michael Jackson II.

Story developing...

Michael Jackson Photo by: John Wright / Guinness World Records / WENN Michael Jackson has died, according to unconfirmed media reports.

The 50-year-old King of Pop was rushed to UCLA Medical Center on Thursday afternoon after he stopped breathing in his Los Angles home. Several media outlets later reported that Jackson had died.

Representatives for the singer did not immediately comment.

Jackson had been busy rehearsing for a high-stakes comeback tour in England, set to start within weeks, with dozens of dates scheduled and tickets selling out quickly. To prepare for the rigors of performing, he was training with Lou Ferrigno, the star of the TV show The Incredible Hulk.

On Thursday afternoon, he collapsed in his home near UCLA and was unresponsive when paramedics arrived, the source says. Paramedics performed CPR, and Jackson was seen with an oxygen mask over his face being hauled on a stretcher to an ambulance, which took him to the hospital just minutes away on campus.

In his 50 years, Jackson went from the cute little singer in his family's group to dazzling headliner and unquestionably the reigning pop star of the '80s to – amid accusations of child molestation – social outcast. The seventh of nine children of Joseph and Katherine Jackson, Michael was born in Gary, Ind., on Aug. 29, 1958, and began his career performing with his brothers. His professional debut with the Jackson 5 came at age 11.

The group set chart records with its first four singles, including "I Want You Back" and "ABC." As a solo artist, Jackson also recorded four studio albums for Motown Records before moving, with his brothers, to Epic Records, where they continued to record as the Jacksons until 1984.

Forming a partnership with producer Quincy Jones after working together on the 1978 movie musical The Wiz – Jackson played a rather sheepish Scarecrow to Diana Ross's Dorothy in this urban adaptation of The Wizard of Oz – Jackson released his solo album Off the Wall, which he co-produced with Jones. Released in 1979, the disc spawned hits including "Don't Stop 'Til You Get Enough" and "Rock With You." His second Epic solo album, 1982's Thriller, is often cited as the best-selling album of all time.