ALPINE, Texas -- The reward for a missing Sul Ross State University student with deep ties to North Texas has now grown to $200,000.

The additional $100,000 increase for information pertaining to Zuzu Verk's disappearance is from H-E-B grocer tycoon Charles Butt, according to Brewster County Sheriff Ronny Dodson.

Alpine police released an updated flyer highlighting the high dollar amount on Monday afternoon, nearly three weeks after Verk vanished from the small town in southwest Texas.

According to police and search warrants, the 21-year-old’s last known location was at the apartment of her boyfriend, Robert Fabian, who remains a suspect in the case. He has not been arrested or charged.

But the Texas Attorney General’s Office is now handling part of the case, and is expected to convene a grand jury soon and subpoena key potential witnesses and persons of interest to testify, according to Police Chief Russell Scown.

Scown said on Monday that there were no new significant developments into Verk’s disappearance.

Landfills in the area were searched recently for potential evidence, although specifics of what authorities were looking for were not released.

Verk graduated from Timber Creek High School in Keller. Her family lived in Coppell before that.