Bella Laboucan-McLean, 25, was found on the ground outside a condominium in the Queen's Quay area early on July 20.
“Bella would have never done anything to intentionally harm herself and we know that something went wrong,” said her sister, Melina Laboucan-Massimo, a well-known aboriginal rights and environmental activist.
“And that's why we are asking for people to come forward with any information that could help with this investigation.”
Toronto police confirm they consider Laboucan-McLean’s death suspicious.
Laboucan-Massimo said her sister attended an event and then went to an after-party at the condo where she fell to her death.
Police told her the people her sister was with did not call after she fell., Laboucan-Massimo said.
Instead, police were alerted by a neighbour who saw Laboucan-McLean's body on the ground after hearing an altercation next door.
Friend Yanni Kalamaras believes that Laboucan-McLean was with people she didn’t know well at the condo that morning.
“I wish we could get answers as soon as possible just to know exactly what happened because I know she wouldn't just do that herself,” he said.
Laboucan-McLean had just graduated from the fashion arts program at Humber College in Toronto, and had plans to move to London, England, to further her education.
"She was a very driven individual," Laboucan-Massimo said. "She had a lot of friends and loved ones. We know that something is amiss in this. Bella would never have done anything to intentionally harm herself."
Laboucan-McLean, who grew up on the Sturgeon Lake Cree First Nation 350 kilometres northwest of Edmonton, leaves behind three older sisters and two younger brothers.
Laboucan-Massimo says they are all dealing with losing an “integral” part of the family.
“Pretty horrific to lose a sibling, but the nature in which it happened is just another level of just — it’s like a horrible nightmare.”