Bill Blair won the nomination on Saturday afternoon, beating four rivals.
Former TV reporter Tim Weber was also in the race until dropping out last month. He put his support behind Blair.
The riding in the city's east end is currently held by Dan Harris for the NDP. But prior to the 2011 election, the Liberals had held Scarborough Southwest for many years. Tom Wappel was its MP from 1997 to 2008, followed by Michelle Simson who won the seat in 2008.
Blair was on the Toronto police force for many years before his ten-year run as its chief. Shortly after retiring earlier this year, he said he was turning to politics.
"I have served this city for nearly four decades," he said during his nomination speech on Saturday.
"And having spent my life in public service, and concluding that career, I sought to continue to serve. To continue to serve this community not only to make it a safe place, but a prosperous place, a place of inclusion, a place of respect."
During his time as police chief, Blair became embroiled in the scandal around former Toronto mayor Rob Ford, announcing at one point that he was "disappointed" in the mayor. That and other actions drew the wrath of both Rob Ford and his brother, then-councillor Doug Ford.
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