WASHINGTON ‒ The Federal Bureau of Investigation said it offering a reward of up to $100,000 for information that leads to the identification and arrest of the individual responsible for killing star conservative influencer Charlie Kirk.

The agency announced the reward on Sept. 11 shortly after releasing a pair images of a person of interest in the Kirk investigation. The images show a man in a stairwell wearing a black long sleave shirt with an American flag, jeans, sunglasses and a dark hat.

People with information have been asked to call 1-800-CALL-FBI if they have information and submit photos and videos at https://tips.fbi.gov/digitalmedia/f4507712a3b2893.

More: Charlie Kirk shooting live updates: New person of interest sought by FBI, rifle found

Kirk, 31 years old, a father of two and a close political ally of President Donald Trump, was speaking outside in a courtyard at Utay Valley University on Wednesday afternoon when a single gut shot pierced his neck.