The photograph of a mum in her graduation gown, surrounded by her husband and four children, was the one that was published around the world.
It served to illustrate just how shocking and sad it was that a father had killed his wife and children before taking his own life at their home in Barry in July 2000.
Catherine and Robert Mochrie had been married for 23 years and shared a £250,000 home with their four children James, 18, Sian, 16, Luke, 14, and 10-year-old Bethan.
They were described by all who knew them as a perfectly loving and happy family, with no sense of the terrible tragedy that was in store.
It might be two decades on but Kevin O'Neill, the lead detective on the case, can remember exactly where he was when he first heard that he needed to get to a house in Barry - immediately.
"I had been driving into work from Merthyr, when I got the call," he remembers. "I was at the Fiddlers Elbow roundabout when I was told that a family had been found dead at a house in Barry. I asked the officer at the scene to talk me through what he knew.
"I asked him if anybody could have broken into the house, and he said there was no way anyone had got into the house. There was definitely no sign of a break in. So, we knew quite early on who had done it. What we had to find out was why."
Friends described them as the "perfect couple" who had a lovely home, went on nice holidays and were usually seen out as a family unit.
Two of Catherine's friends called round to the house concerned when they hadn't heard from her for several days.
They put a ladder to Luke's bedroom window to see a shape on the bed covered with quilts.
Knowing something was badly wrong, they called the police who arrived to find a house that looked like "total normality" downstairs, but upstairs from bedroom to bedroom, Catherine and her children lay arms by their side with their heads slightly tilted, resting on the pillows.
The five of them had each been killed by between three to five blows to the head, in what police later described as nearly an "execution style killing". On each bedstead a rosary was hanging.
A scenes of crime officer had said: "It seemed nearly an execution style killing and I have never come across, in 13 years nearly, a series of killings which appeared so methodical and so chilling and clinical in his approach."
Mr O'Neill said: "It was a very unusual case at the time, and there was a lot of press interest. It was just at the start of rolling 24-hour news and there was a lot of coverage of the case in the UK, and across the world.
"There were press vans and lots of reporters outside the house and I remember we held a press conference at the police station in Barry to give an update on our investigations, and when I got up to speak there was flashing lights going off everywhere. There was a lot of interest in how long the bodies had lain there and there was a lot of questions because it was not evident straightaway why he had done it.
"Then as quickly as they arrived, the press disappeared when Concorde crashed in Paris and we were left to get on with the investigation."
The police investigations found that, as Mr O'Neill explains, there had been a "degree of planning" in the murders and suicide.
It emerged that Robert Mochrie had been alive for more than 24 hours after he had killed his wife and children, while the bodies lay upstairs, because he sent text messages cancelling Bethan's lifts to school on July 11 and deliveries of milk on July 12.
The 45-year-old businessman then took his own life with "the same methodical planning he had used to kill his own family".
The family's bodies were found on July 23.
At the inquest, 10 months after the deaths, it also emerged that Catherine had had an affair with a former colleague, David Osborne, and that Robert has been seeing a Cardiff prostitute once a week.
Robert had been diagnosed with depression in 1990 and 1993, and he had lost money from a venture with the Power Station nightclub in Barry.
A meticulously kept filing system found in the Mochries' master bedroom revealed "very, very worrying" letters from the bank. Credit cards had been used extensively for months. Five months before the murders they stopped paying any bills and slipped into arrears. Eight days before the killings the bank foreclosed on a £80,000 loan; three days before, debt collectors arrived at the door to serve papers on an outstanding £5,000 debt. The Mochries were £200,000 in debt on the day they died.
Mr O'Neill, who worked at South Wales Police for nearly 40 years before becoming leader of Merthyr Tydfil council, said: "What we found was that they were a very normal and very loving family. There was not much lying underneath that would explain why Robert did what he did.
"Sometimes it can be a combination of things, or something little that flicks something in someone to make them do something as extreme as this."
