"My brother was so desperately in love he couldn't cope with losing her.
"The tragedy was that he never showed that despair - not to me or anyone else close to him."
Nadia's decision that they should split was heartbreak enough, Louisa goes on. When she then began an affair with her 26-year-old TV co-star Marc Bannerman, Justin, 31, could take no more and, only days later, hanged himself at their home.
"Since then, she has behaved selfishly, rudely and senselessly," Louisa claims.
Louisa says: "Justin had placed their wedding rings on top of Nadia's note. We found them on Boxing Day, but she has never read what he wrote or collected the rings.
"I don't understand how any wife wouldn't want to read her husband's last words to her."
Horrific. And then to top it all off N makes a public song and dance about Christmas every year.