Ken Urker Gypsy Rose

10:01 AM PT -- The medical examiner tells TMZ ... "As you all know an autopsy was conducted this morning on Mr. Urker. At this time, there is no definitive cause of death. The case remains pending completion of toxicology testing, and no further information regarding the cause of death will be available until those results are received and the investigation is complete."

Gypsy Rose Blanchard's ex-fiancé Ken Urker is now in the hands of a Louisiana coroner -- and TMZ has learned his autopsy is scheduled for today.

In fact, Urker's autopsy is slated for this morning at the Jefferson Parish Forensic Center in Harvey, Louisiana, according to Kayla Breaux, the Lafourche Parish Coroner.

Breaux tells us Urker died in Lafourche Parish ... but since her office doesn't have a pathologist, Ken's body will be examined by a forensic doctor in Jefferson Parish. Breaux also said standard toxicology tests will be performed on Urker.