Brittany Murphy's post mortem released

(AP)

Actress Brittany Murphy's post mortem report details how pneumonia, severe anaemia and prescription medications killed the 8 Mile actress.

The report stated the 32-year-old actress' menstrual period left her in a weakened state after contracting pneumonia.

The report states prescription medications found in Murphy's system were consistent with treatment of a cold or respiratory illness, but contributed to her death.

The actress had been complaining of severe abdominal pain for seven to 10 days before her death.

But the report states the actress' husband and mother thought it was related to Murphy's period, which they told investigators was often severe.

Murphy died on December 20 and her death was ruled accidental.