Mimi O'Donnell has been hit hard by the tragic death of her long-time boyfriend, actor Philip Seymour Hoffman, and reportedly screamed out in anguish upon learning of the tragic news.

A long-time couple, the pair had been together since 1999. Together, Hoffman and O'Donnell were the parents of three; a son Cooper Alexander (11), and two daughters, Tallulah (7) and Willa (5).

Hoffman was found dead in his Greenwich Village apartment on Sunday and was the apparent victim of a heroin overdose injected intravenously. The actor was found dead in his apartment bathroom with the syringe still stuck in his arm, and the drugs next to him.

Both friends and family expressed shock and devastation at his sudden death. Hoffman had previously had a history of hard drug use in his early twenties, but was able to kick the habit for around 23 years. No one, including Mimi, seemed aware that he was in serious danger after his short stint in rehab last year.

ShowBizSpy reported that O'Donnell is 'inconsolable,' all this coming, allegedly, directly on the heels of a hoax claiming that Hoffman had died. "He had his problems, but she thought he was on the road to recovery following his recent rehab stint," a source told the publication.

"We are devastated by the loss of our beloved Phil and appreciate the outpouring of love and support," a statement from the family read. "This is a tragic and sudden loss and we ask that you respect our privacy during this time of grieving."

Mimi is an Artistic Director of an off-Broadway theatre company, LAByrinth. Philip Seymour Hoffman had acted and directed for LAByrinth several times in the past.

Hoffman was to reprise his character in the upcoming next installments of The Hunger Games Trilogy, as Plutarch Heavensbee the Head Gamemaker. In 2005 he won the Oscar for Best Actor for his role in 'Capote,' and has filled a long career with memorable characters appearing in such movies as the 'Big Lebowski,' 'Magnolia,' 'Almost Famous,' and 'Moneyball.'