Utah prosecutors will seek the death penalty against the 22-year-old accused of shooting conservative activist Charlie Kirk and have disclosed text messages and other new details they say fueled the assassination plot.

The suspect, Tyler Robinson, was charged with aggravated murder in a 10-page criminal information on Sept. 16, setting the stage for a high-profile court proceeding in the months ahead.

Robinson faces seven felonies, including discharge of a firearm, obstruction of justice, and witness tampering for allegedly instructing his roommate not to cooperate with authorities.

Utah County Attorney Jeff Gray outlined the charges at a news conference and said authorities will seek the death penalty. Utah is one of 21 states that allow the death penalty.

Kirk's death strikes a "personal and intimate chord," Gray said.