Officer Jason Van Dyke in court in March 2016.Nancy Stone/Pool Chicago Tribune/AP Get your news from a source that’s not owned and controlled by oligarchs. Sign up for the free _Mother Jones

Daily_. Jury selection begins September 5 in the highly anticipated trial of Chicago police officer Jason Van Dyke, who stands accused of first-degree murder, among other charges, in the

shooting death of 17-year-old Laquan McDonald, which numerous commentators have likened to an “execution.” Van Dyke shot and killed McDonald on Chicago’s West Side in October 2014 while

responding to a call about a teen breaking into cars. But city officials waited more than a year to release police dash-cam footage of the shooting—and did so only after a judge ruled in

footage is disturbing and graphic.) [embedded content] The video sparked weeks of protests in Chicago and public calls for the resignation of Mayor Rahm Emanuel. Police Superintendent Garry

McCarthy was subsequently forced out, and county prosecutor Anita Alvarez, whom activists accused of conspiring with Emanuel to cover up the shooting, was defeated at the ballot box by Kim

Foxx, a reform-minded upstart favored by local Black Lives Matter supporters. Van Dyke remains on the force and has been on unpaid suspension since shortly after the shooting. If convicted

of first-degree murder, he could face life in prison. Here’s what else you need to know as the trial commences: WHAT ARE THE CHARGES, AND WHAT IS VAN DYKE’S DEFENSE STRATEGY? The accused

officer is being tried on six counts of first-degree murder, 16 counts of aggravated battery with a firearm, and misconduct in office. The aggravated battery charges—one for each bullet—are

part of a unique legal strategy, veteran Chicago prosecutor Robert Milan told _Mother Jones_ last year. Van Dyke’s attorneys plan to argue he shot McDonald in self-defense, but jurors will

consider the battery charges separately from the murder charges. This, Milan said, means prosecutors could move to disqualify Van Dyke’s self-defense claim for any bullet he fired after the

teenager hit the ground. “If the judge buys it,” he said, then the officer’s defense “goes flying out the window for those shots.” Thus, the jurors could convict Van Dyke of several of the

aggravated battery counts even if they find him not guilty of the other charges. Because a gun was involved, a conviction on any of those counts could result in a prison sentence ranging

from 6 to 60 years. WHAT’S THE LIKELIHOOD VAN DYKE WILL ACTUALLY BE CONVICTED OF MURDER? Pretty low, and local activists have already started planning for how to manage potential unrest if

Van Dyke gets off too easy. Murder convictions are almost unheard of in such cases—although just last week, a Texas cop was sentenced to 15 years in prison after being found guilty of murder

for killing a 15-year-old outside a house party. Police are also occasionally found guilty of manslaughter—usually involuntary, which brings much shorter sentences than voluntary

manslaughter. But police officers are rarely charged—much less convicted—in on-duty shootings. A _Washington Post_ analysis of thousands of police-involved shootings from 2005 to 2015

counted just 54 officers indicted, and most were cleared or acquitted. Van Dyke is the first Chicago cop since 1980 to be charged with first-degree murder for an on-duty shooting. Over the

last 15 years, however, Chicago has spent more than $700 million on legal fees, settlements, and judgments related to abuses by city police. WHAT HAPPENED WITH THOSE OFFICERS WHO SUPPOSEDLY

COVERED FOR VAN DYKE? Three other current and former Chicago police officers were also charged in relation to the McDonald shooting. David March, who is no longer on the force, and officers

Joseph Walsh and Thomas Gaffney face one felony count each of conspiracy, obstruction of justice, and misconduct. The indictment alleges they lied about the nature of the shooting and the

video in official documents “to shield their fellow officer from criminal investigation and prosecution.” On September 5, the same day jury selection begins for Van Dyke, a judge will hear

arguments related to a defense motion to dismiss charges against the other officers. If that prosecution is allowed to proceed, all three officers have opted for a bench trial. WASN’T THE

CHICAGO POLICE DEPARTMENT UNDER A FEDERAL CONSENT DECREE BECAUSE OF THE MCDONALD CASE? Almost. Shortly after the video went public, the Justice Department launched a yearlong investigation

into the Chicago Police Department. In a January 2017 report, it found that city police engaged in a pattern of unconstitutional abuses. So far, according to the _Chicago Reporter_, the

police department has fully implemented only 25 of the 99 reforms the DOJ recommended. A federal consent degree was in the works to force such changes, but after Donald Trump was elected,

Mayor Emanuel and new Attorney General Jeff Sessions put negotiations aside. Several community groups sued the city in response, so city lawyers ultimately negotiated a consent decree with

the Illinois attorney general’s office—a draft agreement was recently made public, but the state is asking a judge to help settle a point of contention: that is, whether Chicago officers are

required to file a report every time they draw their service weapons. HOW WILL THE VAN DYKE TRIAL AFFECT THE MAYORAL ELECTION NEXT YEAR? Update: On Tuesday morning, Mayor Emanuel made a

surprise announcement: He won’t be seeking reelection to a third term. While Emanuel didn’t mention the McDonald shooting at his press conference, it was a major storyline following his 2015

reelection bid, which resulted in a runoff. Local organizers and even city officials accused Emanuel of keeping the shooting quiet for fear it would hurt his reelection chances in the Black

Lives Matter era—a scathing August 2016 _New York Times_ op-ed accused Emanuel of engaging in a “cover-up.” The timing of the trial is pretty terrible for Emanuel, too. (Voting takes place

next February.) Key players in the political turmoil around the McDonald case are now vying for Emanuel’s spot, including disgraced former police superintendent McCarthy, local BLM activist

Ja’Mal Green, and Lori Lightfoot, a longtime player in Chicago politics and head of Chicago’s independent police oversight board until May, when she stepped down to challenge Emanuel.

Lightfoot, a black, openly gay prosecutor, is the likely frontrunner. _This article has been updated._