Davies admitted himself to a psychiatric unit after threatening Ms Evans

Caroline Evans, 27, and William Davies, 59, were found dead at the Red Lion pub in Llangadog, west Wales.

Consultant forensic psychiatrist Dr Peter Wood said the team treating Mr Davies had missed doing a clinical assessment of the risk to others.

But Davies' doctor had found no evidence of "pathological jealousy".

The farmer had been treated at a psychiatric hospital after being arrested for making threats to kill Ms Evans while brandishing a shotgun late in 2002.

He is believed to have shot the six-months-pregnant landlady dead at the Red Lion before turning the gun on himself in February 2003.

His doctor, Tracy McGhie, told the double inquest in Carmarthen she had diagnosed "depression and anger" but found no evidence of psychotic or delusional illness or jealousy.

Dr Wood, speaking as an expert witness, said he accepted much of Dr McGhie's diagnosis but felt she had not considered the evidence pointing to pathological jealousy.

Caroline Evans was six months pregnant when she died

"It's a sad fact that many farmers today kill themselves but they don't go out with shotguns and threaten other people," he told the inquest.

After looking at the notes, Dr Wood said it was obvious that what was missing was a clinical assessment of risks to others.

He added if that assessment had been done, it was possible Davies could have been detained in hospital under the Mental Health Act.

As well as restricting his movements, Dr Wood said Ms Evans would have been given counselling about the risk she faced and could have reacted differently to Davies' obsession with her.

On Tuesday, the jury was told the child Ms Evans was carrying had not been fathered by Davies.