The celebrated pathologist who Anna Nicole Smith hired to conduct a second autopsy on her tragic son Daniel's body has blasted the medic who prescribed the 20-year-old his killer cocktail of anti-depressants and painkillers.

Anna Nicole Smith’s 20-year-old son died from a lethal combination of methadone and two antidepressant drugs, a US-based pathologist who conducted a private autopsy said yesterday.

A lawyer for Anna Nicole Smith today said he was the father of the reality TV star’s newborn girl, who has been the couple’s one “ray of hope” as they have grieved the death of her 20-year-old son in the Bahamas.

Patients on some popular antidepressants should be closely monitored for warning signs of suicide, the US government warned today in asking the makers of 10 drugs to add the caution to their labels.