The group marched from Edgar Ortiz's home in Bellflower to the station, to protest that and other killings by law enforcement.
The shooting happened in Bellflower, as Deputies were dispersing a street takeover.
A person told deputies Ortiz, 32, had stabbed them with a gardening tool. When Deputies approached the suspect, they say he swung the metal claw at them.
MORE | Man holding gardening tool fatally shot by deputies responding to 'street takeover' in Bellflower
His mother spoke out at Saturday's event.
"Oh my God. You know what? Edgar was a good, good son. And right now you know (voice cracks) I lost somebody I love a lot, said Maria Ortiz. "That's hard to me and I lost somebody, that my kids."
She says her son was hard worker, a father of six, and at the time of his death, had a 7th child on the way.