The complaints were filed with the Office of Citizens Complaints.
It has been especially hard on the family of Alberto Cassillas who was shot and killed three years ago today at 13th and Folsom. Minutes later, and a short distance away, another man was shot and killed.
The victim's mother, Elsa Casillas, says it took two years to connect those dots and that the time has come to solve the case.
"I'm not going to wait any longer. I want this solved. So we need to take action right away." Casillas told ABC7 she wants to "push the homicide department into looking at other avenues, whatever they need to do to solve these crimes."
Also filing complaints were the families of Brian Marquez, killed in September of 2005 at 24th and Alabama, and Gabriel Zabala, killed in the Excelsior District in February of 2005.
Six-figure rewards have been offered in all three cases.
The Office of Citizens Complaints is made up of citizens who have never been police officers. It investigates complaints against officers and then forwards its findings to the police commission which can bring discipline against officers.