The estranged wife of a celebrity dentist who was shot dead by police after attacking two women in Sydney’s inner city has penned an open letter to him on social media that reveals the “affairs”, “secrets” and “abuse” she suffered in the pair’s marriage.

Cassandra Lin, who had separated from her husband Steven Lin more than a year before his death, wrote in the letter that she was carrying the “pain of betrayal”, but vowed to raise the pair’s children in his honour.

She revealed he had fathered a child without her knowledge, which had “shattered the trust” between the pair.

Cassandra Lin (left), revealed her estranged husband Steven Lin (right) had fathered a child behind her back. (Instagram)

“The truth is that my world came crashing down when I discovered the life you had been living behind my back,” Cassandra wrote.

“The affairs. The secrets. The abuse. The child you fathered that I knew nothing about.

“It shattered the trust I had placed in you and the future I thought we were building together.

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“The pain of that betrayal is something I’m still learning how to carry.”

Steven, aged 41, broke into a Potts Point apartment complex on March 3 while under the influence of drugs and attacked two women, Chloe Paul and Christine Campeau, as they were at home.

Lin, aged 41, had amassed a high profile as a prominent dentist and social media influencer. (Sydney Morning Herald)

Police rushed to the building and shot Lin with a Taser, which was ruled “ineffective”. He was then shot with one round and declared dead at the scene.

The two injured women were rushed to hospital and underwent surgery for extensive facial injuries.

In her letter, his estranged wife described him as “complicated” and “flawed”.

“Standing here today, I’m reminded that people are never just the worst thing they’ve done, nor only the best,” she wrote.

“You were complicated. You were flawed. You made choices that hurt me deeply and changed our lives forever.

“I know you’ve heard it all before, so I don’t say it anymore, I had to stand back and let you fight your secret war. A war which you lost in the end.”

Chloe Paul and Christine Campeau survived the horrifying attack and were widely praised for their strength. (A Current Affair)

Cassandra ended her letter by pledging to care for the couple’s children without him.

“They deserve to know that their father loved them. Your story doesn’t end here, because it lives on in them,” she wrote.

“And while our path together didn’t end the way either of us imagined, I will carry forward the responsibility we began together – raising the beautiful children we brought into this world.”

Steven, author of The Dental Diet, had amassed a prominent social media presence with more than 250,000 Instagram followers.The Dental Diet.

He was a former principal of Helix Dentistry on the NSW Central Coast. He separated from his wife Cassandra in early 2024.

His involvement with Helix Dentistry ended around the same time.

It has been previously reported that the 41-year-old had faced court for a raft of offences in recent years, including stalking, assaults, choking and breaching apprehended violence orders.

Cassandra Lin’s full open letter

The letter was posted to Cassandra’s Instagram. (Instagram.com/thecassandraapproach)
In it she described her estranged husband as living a separate, secret life. (Instagram.com/thecassandraapproach)
The pair separated in 2024. (Instagram.com/thecassandraapproach)
In the letter she pledged to raise the pair’s children to the best of her ability. (Instagram.com/thecassandraapproach)