Dr. Joshua Perper has just announced he will hold a news conference on Monday at 10:30 AM to reveal what killed Anna Nicole Smith.

TMZ has just spoken with Gary Bitner, the spokesperson for the Seminole Police Department. Bitner said the findings at Monday's news conference "are going to be a significant announcement."

Bitner also told TMZ that the Seminole Police, the State Attorney and the Medical Examiner have been closely working together, and "it continues to be a non-criminal, unexplained death investigation."

Bitner added Perper's findings "are going to provide some resolution" in the death of Anna Nicole.