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.