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CHICAGO — The Chicago Police Board voted Thursday to fire a Chicago police officer who shot and killed two people in 2015.

The board unanimously approved firing Robert Rialmo for the Dec. 26, 2015 shooting death of Bettie Jones, 55, and Quintonio LeGrier, 19, during a domestic disturbance call. The board said Rialmo should have known better and said his actions were inconsistent with his training.

At the time of the shooting, Rialmo and his partner had answered a 911 call from LeGrier’s father called asking for help because his son was having a mental health crisis. The father had barricaded himself in a bedroom while awaiting police and asked neighbor Jones to let police in. When she opened the door, Rialmo said LeGrier came at him with a baseball bat. The officer fired his gun killing both of them.

Rialmo was charged with unlawful and unnecessary use of a weapon, and bringing discredit upon the police department.

A jury awarded more than $1 million to LeGrier’s family in a wrongful death lawsuit, but a judge reversed it, noting jurors also found Rialmo feared for his life. The City Council agreed to pay the Jones family $16 million.

Last year, in a separate trial, Rialmo was found not guilty on battery charges for a bar fight at an Edison Park restaurant.

In response to the boards decision to fire Rialmo, Police Union President Kevin Graham said it sets a bad precedent.

Rialmo was not present at Thursday’s hearing, but the police union said it will appeal the decision in a court of law within 30 days.