According to her official Twitter account, Joanie Laurer, better known as WWE Diva Chyna, has passed away at age 45:
No further information has been released at this time. We’ll continue to update as the story develops.
Chyna’s groundbreaking WWE career included becoming the first female competitor to qualify for the King of the Ring tournament, the first female #1 contender for the WWF Championship, and the first female Intercontinental Champion. Her post-wrestling career saw Laurer go through a very public battle with substance abuse, and continued bizarre and erratic behaviour in recent years. The troubled wrestler had a complicated relationship with WWE, fraught with allegations of abuse, and certainly not helped by an adult film parody featuring WWE wrestlers and McMahon family member lookalikes. Laurer was was seeking to mend this relationship with WWE before her death, and crowdfunded a documentary to capture her journey.
So more information via ABC News and the Redondo police.