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FORT WORTH (CBSDFW.COM) – A Collin County Grand Jury is set to take up the case of Christina Morris, the Fort Worth woman missing since August and last seen in Plano. Grand Jury records indicate the panel is looking at the last man known to have been with her.

Subpoenas indicate a Grand Jury will hear the case December 4, and Christina Morris’ mother is grateful the investigative process is picking up momentum.

“My heart is literally shattered right now,” she told CBS 11 News as she bundled up to begin another walking search for clues Monday afternoon. Jonni McElroy is still searching. Searching for her daughter who disappeared nearly three months ago.

“I still believe she’s alive until I’m otherwise proven wrong. If I am proven wrong and she’s not then she deserves a proper burial… everything,” she said.

The subpoenas show the Grand Jury wants information on and interviews with Enrique Arochi, also known as Enrique Arochi Gutierrez. He is seen in parking surveillance garage video with Morris in the early morning hours of the last known day she was seen alive.

WATCH: Last Person Seen With Missing Woman Speaks With CBS 11

He has denied involvement in her disappearance but investigators executed a search warrant of his car. McElroy believes he knows more than he is saying, and as a mother, implores him to speak out. “I hope that he realizes and sees that all we’re seeking is the truth, the bottom is we want answers. If he knows those answers we need him to be truthful (and) give us those answers,” she said.

TIMELINE OF EVENTS IN CHRISTINA MORRIS CASE

August 30 (3:55 a.m.): Morris last seen

August 30 (10:15 a.m.): Arochi Scrubs Car at Kroger (surveillance footage)

September 2: Morris reported missing

September 3:  Arochi interviewed twice

September 4:  Arochi’s car searched

September 8: car damage examined (inconsistent with Arochi’s explanation)

September 10: Arochi’s coworker interviewed

September 24: Police obtain surveillance video from Kroger in Allen

September 26: Search warrant issued for car

Read full search warrant:

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