Flags continue to fly at half-staff Friday, Sept. 12, in memory of Charlie Kirk.

On Wednesday, Sept. 10, conservative activist and Turning Point USA co-founder Charlie Kirk died when he was shot on a college campus in Utah.

Hours after Kirk’s death, President Trump ordered flags across the United States to be lowered to half-staff until Sunday, Sept. 14.

➤ Live updates: New video shows killer’s getaway after Charlie Kirk’s murder

Here’s what you should know.

Charlie Kirk shot in ‘political assassination’

Conservative activist and Turning Point USA co-founder Charlie Kirk was fatally shot during an event at Utah Valley University in Orem, Utah, on Wednesday, Sept. 10, in what Utah’s governor described as a “political assassination.”

“This is a dark day for our state, it’s a tragic day for our nation,” Utah Gov. Spencer Cox said at a news conference Wednesday.

➤ Conservative leader Charlie Kirk shot and killed at Utah event. Who was Charlie Kirk?

“I want to be very clear that this is a political assassination.”

Kirk was speaking to a crowd of about 3,000 people when a single gunshot was heard.

Video released Thursday, Sept. 11, shows the suspect running across a roof and jumping to the ground. Authorities are asking for the public’s help to identify him as the manhunt continues.

President Trump: Charlie Kirk was ‘martyr for truth, freedom’

Calling Kirk “a martyr for truth and freedom,” Trump on Wednesday attacked the “radical Left” and said its heated rhetoric was “directly responsible for the terrorism that we’re seeing in our country today.”

➤ What did Trump say about the Charlie Kirk shooting death? ‘We must all pray

Trump said he was “filled with grief and anger at the heinous assassination” of Kirk, who was a political ally and helped fuel his return to the White House.

The president said he would award Kirk the Presidential Medal of Freedom posthumously.

Flags to fly at half-staff for Charlie Kirk

In a proclamation issued Sept. 10, Trump ordered flags across the U.S. to be flown at half-staff for Kirk through sunset Sunday, Sept. 14.

How long should flags be flown at half-staff for Charlie Kirk?

Flags should be flown at half-staff until sunset Sept. 14 for Charlie Kirk.

Flags flown at half-staff Sept. 11 for both Charlie Kirk, Patriot Day

Sept. 11 is a day observed throughout the United States to honor the nearly 3,000 people who lost their lives in the terrorist attacks that took place Sept. 11, 2001, in New York City, Washington, D.C., and in a Pennsylvania field.

The attacks were “by far the deadliest terrorist attacks ever launched against the United States.”

“We honor and remember the souls who perished on September 11, 2001, and those who succumbed to illness and injury in the days, months, and years that followed,” Trump said in a proclamation.

“We pray for the grieving families who carry their memories and for the survivors who bear enduring scars.”

➤ Florida, US flags to fly at half-staff for Patriot Day. What to know

On Sept. 11, the flag is lowered to half-staff and a moment of silence was observed at 8:46 a.m. ET.

How to correctly fly your flag at half-staff

On days when the flag is flown at half-staff, it should first be raised to the top of the pole for an instant and then lowered to the half-staff position, according to the U.S. Flag Code.

Before lowering the flag, it should again be raised to the top before being lowered for the day.

Do flags fly at half-mast or half-staff?

On ships and at naval stations ashore, flags are flown at half-mast.

On shore, flags are flown at half-staff.

This article originally appeared on Naples Daily News: Flags continue to be flown at half-mast for Charlie Kirk