() A memorial for assassinated conservative activist Charlie Kirk will be held on Sept. 21, a person familiar with the details told .  

Details on public attendance are unclear, and the person did not specify a funeral date.

There will be private events in the days prior, including a prayer vigil in Washington, D.C. on Sunday.

Members of Congress and other political figures will hold a memorial service and prayer vigil this day at 6 p.m. ET near the White House and United States Capitol.

“This service will be a unifying event focused on prayer, mourning, and celebrating the life, legacy, and memory of Charlie Kirk a national treasure whose life was cut far too short,” a press release from Arizona state Sen. Jack Hoffman, a Republican, said.

Kirk, the 31-year-old founder of political organization Turning Point USA, was fatally shot at a Utah Valley University event on Sept. 10. A suspect, Tyler Robinson, 22, was arrested two days later.

“The President was clear: the perpetrator of this horrific act will pay for what they did. They will face the full wrath of the American justice system. And any other left-wing whack jobs who engage in targeted political violence like the tragic assassination of Charlie Kirk will be held accountable to the fullest extent of the law,” Abigail Jackson, a White House spokesperson, told .

‘s Andrew Fischer Espitallier and Kellie Meyer contributed to this report.