A violent attack by an estranged husband who gunned down his wife and then killed himself might have been prevented by better police communication, a watchdog has said.
Failure to share key risk information about the gunman's reported bail breaches meant a chance to put him behind bars was missed.
Darren Williams, 43, burst into a hair salon in Newport, south Wales, in August last year and blasted his wife with a shotgun.
Rachel Williams, 37, was hit in the knee and two customers were slightly injured in the attack.
The shooting triggered a six-hour manhunt by Gwent Police which ended when Williams was found dead at the nearby Brynglas woods.
Six weeks later the couple's 16-year-old son Jack was discovered hanging in the same woodland.
The Independent Police Complaints Commission upheld four complaints against Gwent Police on Wednesday.
The watchdog's findings resulted from an investigation carried out in the wake of the deaths.
Williams was on bail at the time of the attack after a court appearance for assaulting his wife more than a month before.