A key vulnerability in the prosecution’s case against Tyler Robinson, the man accused of killing conservative activist Charlie Kirk, could be the timeline of events, according to a prominent Utah defense attorney, adding that the defense is likely to prolong the discovery process for up to a year before the case reaches a preliminary hearing.

Kirk, 31, a father of two, was shot and killed around 12:20 p.m. on September 10 while speaking at a Turning Point USA event at Utah Valley University. He was the founder of the conservative student organization, which grew into a national movement credited with helping to expand youth engagement within the Republican Party.

“There’s just so much we don’t know yet as this case develops,” Skye Lazaro, of the Salt Lake City firm, Ray Quinney & Nebeker, told Fox News.

The defense team also has limited information at this stage. The discovery process began Monday, with prosecutors given five days to make their initial disclosures. Robinson’s attorneys have already postponed his waiver hearing by one month.

Some evidence has been made public through news briefings, statements from law enforcement, and charging documents filed last week. Those filings include text messages between Robinson and his roommate and romantic partner, Lance Twiggs, in which Robinson allegedly claimed responsibility for Kirk’s killing. However, the messages do not include timestamps.

Robinson, 22, was arrested in his hometown in southern Utah 33 hours after the shooting. Authorities said he had returned to the crime scene prior to his arrest, where police later found the suspected murder weapon, according to a report from Fox News Digital.

Investigators have not clarified the timeline of his interaction with a police officer stationed near the perimeter of the area, the outlet noted.

“If it doesn’t line up in a way that makes sense, it could definitely be bad for them,” Lazaro told Fox.

According to a law enforcement source, Robinson told an officer at the scene that he was attempting to retrieve an item he had left near a parking garage close to where police later recovered the rifle believed to be the murder weapon, Fox noted further.

At the time, the interaction did not raise suspicion, as hundreds of attendees had dropped personal belongings while fleeing the area following Kirk’s fatal shooting before an audience of roughly 3,000 people.