The brother of Ontario teenager Nadia Kajouji says a U.S. court ruling that reversed the conviction of a man accused of encouraging her suicide is “disappointing,” but nothing will bring his sister back.

Marc Kajouji told CTV’s Canada AM Thursday that the Minnesota Supreme Court ruling seems to be based on “semantics,” but he’s staying focused on his work with a suicide prevention organization in Canada.

“He still has to deal with this,” Kajouji said of William Melchert-Dinkel, a 51-year-old former nurse from Minnesota who was convicted in 2011 of encouraging Nadia Kajouji and another person he met online to kill themselves.

Nadia, from Brampton, Ont., was 18 and attending Carleton University when she jumped into the Ottawa River in 2008. Melchert-Dinkel was also accused of encouraging 32-year-old Mark Drybrough to kill himself in England three years earlier.

On Wednesday, the Minnesota Supreme Court ruled that the language in the state’s assisted-suicide law pertaining to "encouraging" suicide is unconstitutional. Melchert-Dinkel’s case will now go back to a lower court.

His lawyer argued that he was exercising his right to free speech, and that the law -- which states that anyone who "intentionally advises, encourages, or assists another in taking the other's own life" is guilty of a crime -- was too broad.

Kajouji said Thursday that the ruling stresses why suicide prevention and awareness “needs to be dealt with a sense of urgency.”

Since his sister’s death, he has been working with YourLifeCounts.org, founded in 2000 to help people who have attempted suicide or lost a loved one to suicide. Kajouji also said he supports a private member’s bill, C300, which calls for a national framework for suicide prevention.

“There’s a lot of great minds in Canada that can help,” he said.

Leading up to his 2011 conviction, court had heard that Melchert-Dinkel sought out depressed people online, where he posed as a suicidal, compassionate female nurse.

Melchert-Dinkel told police he did it for the "thrill of the chase." But in his appeal, he argued that he had no influence on Kajouji and Drybrough’s actions, even though prosecutors alleged that he gave both of them step-by-step instructions.

With files from The Associated Press