The agency that investigates serious incidents involving police in Nova Scotia says there are no grounds for charges in the death of a man who stopped breathing in RCMP custody last summer.

The 40-year-old man died after being arrested in Liverpool for public intoxication in July. The Serious Incident Response Team said he was lodged in the cells breathing, but not conscious.

Paramedics brought the man to the hospital after he stopped breathing. He was pronounced dead.

The SIRT investigation said the man purposely overdosed on morphine and alcohol.

The report did note however that "while the actions of the jail guard were reasonable, by placing the man in the cell while unconscious the two RCMP officers may have breached RCMP policy by not seeking further medical attention."

But for criminal offences to stick SIRT said the officers' actions must have caused the man’s death.

A medical examiner said it was speculative to say if earlier medical attention would have saved the man's life.