New Marilyn Monroe documentary confirms 'family secret' about her biological father

Watch: Marilyn Monroe documentary claims to reveal identity of biological father

A new investigative documentary will shed light on Marilyn Monroe’s life and claims to finally provide the answers about the identity of her biological father.

Marilyn, Her Final Secret is a one-hour documentary that promises to give fans a peek into the life of the Hollywood icon, whose real name was Norma Jeane Baker.

According to Variety, Label News has wrapped production and the project will detail the star's fraught search for her father. Using scientific evidence to confirm her parentage, producers reportedly tested a strand of Marilyn's hair — taken by the person who embalmed her in 1962 — to extract her DNA profile.

Read more: Marilyn Monroe's extraordinarily kind gesture that helped Ella Fitzgerald's career

It is then compared to a sample of saliva from the great-grandchild of her suspected father, Charles Stanley Gifford. The father listed on Monroe's 1926 birth certificate was Martin Edward Mortensen, the man who had divorced her mother Gladys before she was even conceived. Gifford had an affair with Monroe's mother but is said to have rejected her when she became pregnant.

Director Francois Pomès confirmed that the production uncovered a long-held 'family secret' as he stated: “The thing that touched me the most was seeing the reaction of Gifford's family who were overwhelmed by this irrefutable evidence."

The documentary is set for a June release on the French channel Toute l'Histoire, one month after another documentary about the actor is set to land on Netflix.

The streaming service is hoping to shed some light on the last days of this mysterious star with the upcoming project titled The Mystery of Marilyn Monroe: The Unheard Tapes.

Sixty years after her death, the documentary will use previously unreleased recordings to paint a new picture of Monroe and the circumstances surrounding her passing.

"Hollywood icon Marilyn Monroe’s tragic death spawned conspiracies and rumours for decades, often overshadowing her talent and shrewdness," the official synopsis reads.

"By piecing together her final weeks, days and hours through previously unheard recordings of those who knew her best, this feature illuminates more of her glamorous, complicated life, and offers a new perspective on that fateful night."

Read more: Marilyn Monroe's iconic 'Happy Birthday Mr President' dress sells

Though she was internationally famous, an iconic sex symbol and featured in several films, Monroe struggled with addiction and mood disorders over the course of her life.

Married three times — most notably to baseball star Joe DiMaggio and playwright Arthur Miller — she died in 1962 at the age of 36 after an overdose of barbiturates. The death was ruled a probable suicide.

Meanwhile, Ana de Armas will play Monroe in the upcoming Netflix film, Blonde, based on Joyce Carol Oates’s novel about her life.

Watch: Marilyn Monroe ‘assassinated over UFO knowledge’