Timeline of events

May 14, 2017: Tashii Brown dies at Sunrise Hospital and Medical Center after an encounter with Las Vegas police.

June 5, 2017: Officer Kenneth Lopera is arrested by Las Vegas police. Sheriff Joe Lombardo says Lopera will be charged with involuntary manslaughter and oppression under color of office.

June 12, 2017: Lopera is charged in Las Vegas Justice Court.

July 18, 2017: A federal civil rights lawsuit is filed on behalf of Brown’s children. The lawsuit accuses the department of excessive force and gross negligence.

Aug. 18, 2017: Lopera sues the Metropolitan Police Department, arguing that he should not have to submit to questioning.

Sept. 15, 2017: Metro use-of-force policy changes go into effect. Among the changes is the reclassification of the Lateral Vascular Neck Restraint, the neckhold police said Lopera did not use in his encounter with Brown. The LVNR was reclassified from a low-level use of force to intermediate or deadly. Brown’s case was one of many that influenced the change, police said.

Nov. 1, 2017: Metro Sgt. Travis Crumrine is demoted to police officer. Crumrine was the sergeant in charge of Lopera at the time of the encounter with Brown.

March 2018: Lopera’s criminal case is taken up by a grand jury, according to

Las Vegas Police Protective Association President Steve Grammas.

May 13, 2018: Brown’s mother, Trinita Farmer, files a federal lawsuit against

Lopera and three other Metro officers. The lawsuit alleges that the other officers did not intervene during the encounter.

May 24, 2018: Chief Deputy District Attorney Marc Digiacomo says at a status hearing that the case is being reviewed by the Force Science Institute.