Sterling, 37, was shot dead by two police officers in Baton Rogue, Louisiana, on July 5 after an anonymous 911 caller reported that he was threatening people with a gun outside a convenience store, where he was selling CDs, reported Ace Showbiz.
Paying her tribute to Sterling, Mischa, 30, wrote alongside her bikini-clad picture, "I'm truly heart broken to watch videos like the #altonsterling execution. This may have been going on forever in the United States but thank god the pigs get caught on camera now.
"The world is a precarious place right now.#stop #reflect and #act appropriately."
The photo has since been removed but not before she faced the ire of social media users.
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One commenter wrote, "This isn't about you. Change the pic if you want people to take your expressed sentiment seriously."
A second user posted, "Talking about someone's death while shamelessly posting a picture of yourself in a bikini is disgusting."
Mischa has yet to respond to the backlash.
Other celebrities who paid tribute to Alton Sterling included Drake, Nicki Minaj, Jesse Williams and Kanye West.