The medical examiner investigating Anna Nicole Smith's death will release an autopsy report Monday, presumably disclosing what killed the former Playboy Playmate.

Dr. Joshua Perper, the medical examiner for Broward County, Fla., and Seminole Police Chief Charlie Tiger said they will hold a joint news conference to discuss the cause of death.

The conference will take place at 10:30 a.m. EDT Monday outside the Broward County Medical Examiner's Office.

A spokesman for the Seminole Police Department, Gary Bitner, told TMZ the findings at Monday's news conference "are going to be a significant announcement."

"It continues to be a non-criminal, unexplained death," but Perper's findings "are going to provide some resolution" in Smith's death, Bitner told TMZ.

Perper's initial autopsy report showed no immediate indication of a drug overdose and no sign of major external injuries, but a conclusive cause of death has been pending.

The medical examiner delayed the release of the full autopsy report after police gave him additional evidence, though authorities have not said what that is.

Prosecutors have said they are not treating the case as a homicide.

Speculation about what led to Smith's untimely demise on Feb. 8 at age 39 has run rampant since she collapsed in a Florida hotel room and was later pronounced dead at a nearby hospital, with theories ranging from a drug overdose and pneumonia to suicide and murder.

An inquest into what killed Smith's 20-year-old son Daniel in September will also begin on Monday. The official report found that he died of drug-related causes brought on by a lethal interaction of medications.

On Tuesday, a Bahamian judge ordered Smith's baby daughter to undergo a DNA test to determine who is the child's father.

Smith's companion Howard K. Stern and her ex-boyfriend Larry Birkhead maintain they are 6-month-old Dannielynn's father and are fighting for custody, along with her estranged mother Virgie Arthur.

Stern, who is listed as the baby's father on her birth certificate, has been caring for the girl in the gated, waterfront home where he lived with Smith in the months before she died. The Bahamian courts have ordered Stern not to leave the country with the girl before a custody ruling.

Arthur wants to take Dannielynn from Stern, arguing she could provide a more stable home.

Birkhead, a Los Angeles photographer, filed a lawsuit in Los Angeles in October seeking a court order to demand Smith bring the baby to California for a test. A judge ruled in his favor in December, but efforts by his legal team to secure a DNA sample had not been successful until this week.

The girl, Dannielynn Hope Marshall Stern, could inherit millions from the estate of Smith's late husband, Texas oil tycoon J. Howard Marshall II. Smith had been fighting his family over his estimated $500 million fortune since his death in 1995.

Frederic von Anhalt, the husband of Zsa Zsa Gabor, also says he may be Dannielynn's father. Last month, he too filed legal documents seeking a DNA test to determine if he is the father.

FOX News' Phil Keating and The Associated Press contributed to this report.