"I was telling police to stop. Don't shoot my son, please don't shoot my son," Catherine Wallace said Tuesday night.
Wallace Jr., 27, a Black man who police say was armed with a knife, was killed Monday after police fired more than a dozen shots in West Philadelphia around 3:50 p.m.
"They paid me no mind, and shot my son," she said.
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Wallace Jr.'s parents say their son suffered from mental health issues and that police had been called to the home earlier in the day before it turned deadly.
Father of Walter Wallace Jr.: No parent should have to experience what we went though
"I can't even sleep at night. Every time I close my eyes I got flashbacks of multiple shots," said Walter Wallace Sr.
Many are left wondering if this shooting could have been avoided.
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"How do you feel to make the 911 call to get help for your son and the end result is murder?" said Wallace Jr.'s cousin, Anthony Fitzhugh.
"You could have pulled out a taser. You could have shot him in the leg," said resident Jada Hilton.
RAW VIDEO: Video shows officers yelling 'put the knife down' before fatal shooting
Video shows officers yelling 'put the knife down' before fatal shooting
The man's death sparked both protests and looting for a second night on Tuesday.
"Burning down people's businesses, looting, stealing -- that's not the answer. That's not the solution," said Fitzhugh.
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WATCH: Neighbors, business owners frustrated after night of unrest in West Philadelphia
Neighbors, business owners frustrated after night of unrest in West Philadelphia
Philadelphia Police Commissioner Danielle Outlaw has promised a full and comprehensive investigation.
The department is completing a threat assessment on whether to release the names of the officers involved. Outlaw said the names would be released as long as that does not put the officers' safety at risk.