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He said his sister was brought to Vancouver General Hospital where she died early Sunday, and both his parents had also died. 

They were among 11 people killed, while about three dozen were sent to hospitals around the Lower Mainland.

Samper has yet to be allowed to see his family members' bodies. 

"I'm just destroyed," Samper said Tuesday. "My whole world's taken away from me." 

Samper said the family came to Canada in the early 2000s, in part to escape violence in Colombia, and he's now trying to understand what happened and why. 

"My parents sacrificed everything in Colombia, their careers, their lifestyle, everything to give us a better future here in Canada," he said. "It just doesn't make any sense. Canada is supposed to be a safe place."

His family has started an online fundraiser through the GoFundMe platform.

Samper said he's been left with many questions about what happened, and wonders why the festival didn't have barricades like other events, noting that he was at a Vaisakhi event the previous week where protective measures were taken. 

He said his parents were the "nicest people" who helped many others, and the family was "very, very close." 

"They won't let us see the bodies because everything's under investigation," he said. "So, I never even got to say goodbye to my parents." 

He said he's been dealing with a "bombardment" of phone calls about the tragedy, and believes it's important to speak out because "we need to get this message across, like, it's unacceptable this was allowed to happen."

"Where's the security? Where were the police when this happened? Also, like the social system, I heard this person that killed everyone, you know, had a very tragic life." 

Thirty-year-old Adam Kai-Ji Lo has been charged with eight counts of second-degree murder and police say more charges will likely come.

The B.C. Health Ministry said Tuesday that before the attack, Lo had been under the care of a mental health team, but nothing indicated a change in his condition that warranted involuntarily hospitalization, and Lo gave "no indication of violence" to the team from Vancouver Coastal Health.

Vancouver police Sgt. Steve Addison said at a briefing that the city hosted more than 3,200 events last year and only nine featured heavy barriers, such as "big dump trucks."

He said the decision on when to deploy heavy vehicle barriers "is contingent on the nature of the event, the risk assessment of the event and where crowds will be."

Another family of three was also killed in the attack — Richard Le, his wife Linh Hoang and their five-year-old daughter Katie. Le's 16-year-old son wasn't at the festival.

Among the other victims was Kira Salim, who is being remembered as a dedicated educator and activist who fiercely defended LGBTQ rights in the community.

Vancouver-based Latincouver, a community group promoting Latin American heritage and culture, says in a Facebook post that Salim was "a proud Brazilian" and "a passionate advocate for human rights."

Latincouver says Salim volunteered for the organization during Latin American Heritage Month in 2022 and brought "kindness, talent and energy" to the community.

In a separate post, LGBTQ advocacy group New West Pride says the community in New Westminster, B.C., where Salim worked as a teacher-counsellor, is in mourning.

The post says Salim was "an epic drag king, a wonderful exuberant contributor to our local community, volunteer, activist, local educator, mental health worker. Kira will be deeply missed." 

The School of Music at the University of British Columbia says in a statement on Facebook that Salim worked at the school's front desk in 2023. It said they were a "much-loved member of our community" as well as noting their roles as activist and educator.

"We are heartbroken and extend our deepest condolences to Kira’s family, friends and all who were fortunate to know them," the statement says.

Samper said he's worried about those who survived the tragedy too. 

"There were many victims in this tragedy, and these victims, if they're not supported correctly, in 10 years from now … they'll still be angry, resentful," he said. 

"I am lucky to have a big family and have a lot of support. Had I not had any of that, I would be very angry, very resentful. But right now I'm being flooded with lots of love." 

On the web:

— With files from Chuck Chiang and Brenna Owen.

This report by ´ºÉ«Ö±²¥was first published April 29, 2025.