Here's what we know about the officers.
He'd been with the department less than five years
On Tuesday, Deputy Troy Chisum, 39, responded to a battery and disturbance call in Avon, Illinois, Fulton County Sheriff Jeff Standard said in a news release.Multiple shots were fired during the incident, and the suspect initially barricaded himself inside the home, police said.Chisum was fatally wounded. He had been with the department for four and a half years, the sheriff said. He was a paramedic and a member of the West Central Special Response Team and the Illinois Law Enforcement Alarm System's Weapons of Mass Destruction/Special Response Team, the sheriff said. "I would like to extend our deepest condolences to the family and friends of Deputy Chisum," Standard said. "Deputy Chisum dedicated his life to the service of his community. His legacy and sacrifice will forever be remembered."The suspect in the shooting, 42-year-old Nathan Woodring, was arrested later Wednesday, the Illinois State Police said in a statement.
An officer awaiting marriage
North County Police Cooperative officer Michael Langsdorf was shot and killed Sunday, while responding to a call of someone trying to cash a bad check, the cooperative said.Police later arrested 26-year-old Bonette Kymbrelle Meeks and he was charged in the officer's death."Meeks was also charged with Armed Criminal Action, Unlawful Possession of a Firearm and Felony Resisting. Meeks remains in custody with NO BOND ALLOWED," police said. Meeks has an "extensive criminal history"and is a "multi-convicted felon" in another state, said the police cooperative, which operates in the St. Louis, Missouri, surrounding area. The 40-year-old police officer had "17 years of prior police experience," the cooperative said. He was engaged to be married, leaves behind two children and "an enormous amount of friends and family."
The department's first in nearly 40 years
Mission Police Department's Cpl. Jose "Speedy" Espericueta was responding to an assistance call from another officer Thursday night in Mission, Texas,when he was gunned down by a fleeing suspect, after a woman saidhe had shot at her car. 
"Our officers, as well as everyone in the line of duty, work in an incredibly difficult environment," Police Chief Robert Dominguez said during a press conference Friday. "At times, as we see today, this environment can be extremely dangerous."Espericueta had recently received a Meritorious Service Award after saving an elderly woman from a burning house, according to CNN affiliate KGBT.He was the department's first officer killed in the line of duty since December 1978, the chief said. Espericueta leaves behind a wife and two children.
An officer fresh out of the academy
Sacramento police officer Tara O'Sullivan lay bleeding for nearly an hour on Wednesday as her fellow police officers battled a gunman after responding to a disturbance call.Read More – Source
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CNN
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