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Texas teen Kaitlin Hernandez was found brutally murdered under a bridge in her neighborhood two weeks ago, and her family is demanding justice for the "sweet" 17-year-old high schooler.

"The person or persons who did this to my niece, Kaitlin, is still out there, and we just want them to come forward," Hernandez's aunt, Crystal Rodriguez, told Fox News Digital.

Hernandez went on a walk around her San Antonio neighborhood with a male friend around 7:30 p.m. on the evening of March 12, when she vanished. 

Hernandez's grandmother expected her to be gone for a half hour to an hour at most after the 17-year-old left for the walk, but when more time passed, she began to worry about the teen and contacted police. Just hours later, San Antonio police found her naked body in a drainage ditch beneath a bridge on the 7600 block of Dell Oak Drive.

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Kaitlin Hernandez wearing a cap and gown

Kaitlin Hernandez was about to graduate high school in May. (Family handout)

Police detained the friend, whom Hernandez had spent time with before, as a person of interest and has been "cooperating and assisting in the investigation," according to authorities and Hernandez's family. He had not been named or cleared as a suspect at the time of publication. 

"At this time, this investigation is still active and ongoing by the SAPD Homicide Unit," San Antonio Police Department spokesperson Ricardo Guzman told Fox News Digital in a statement. "Currently, we have no updates to provide at this time."

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Kaitlin Hernandez wearing a prom dress

San Antonio police are looking for the person who brutally murdered Kaitlin Hernandez. (GoFundMe)

The Bexar County Medical Examiner's Office confirmed to Fox News Digital that Hernandez's cause of death was strangulation.

"Kaitlin didn't hate anybody. Nobody that we're aware of hated Kaitlin. She just got baptized last year. She was getting more involved into God. She was going to church. She loved and cared for animals. She was going to be a veterinarian after she graduated," Rodriguez said.

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The bridge in San Antonio where Kaitlin Hernandez was found dead on March 12

San Antonio teen Kaitlin Hernandez was found dead beneath a bridge after she was reported missing. (Google Maps)

"She had a lot of goals and a lot of dreams, and they took that from her," Rodriguez continued through tears. "She was loving. She was kind. She was never mean to anybody. I don't know why somebody would do this to her."

"She had a lot of goals and a lot of dreams, and they took that from her."

— Kaitlin Hernandez's aunt Crystal Rodriguez

Rodriguez said the area where her niece's body was recovered has "a lot of homeless" and "drug activity."

Kaitlin Hernandez and her family

Kaitlin Hernandez's family members are desperate for answers after the 17-year-old high school senior was found dead. (Family handout)

"She loved everybody and she was so sweet. She encouraged everybody. We don't know who could've wanted to hurt her," she said.

The San Antonio community remembered Hernandez during a march on Sunday, starting at the bridge where she was found dead.

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People marching for Kaitlin Hernandez along Dell Oaks Drive in San Antonio, Texas

The San Antonio community gathered around Dell Oaks Drive on Sunday to remember Kaitlin Hernandez. (FOX 29 San Antonio )

"The message to the public is just, please, if they know anything, just come forward. We want justice. We want peace," Rodriguez said. "And just… hug your loved ones every day because one day, we're here; one day, we might not be."

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Hernandez's aunt also thanked former Republican Texas Rep. Mayra Flores for her help in sharing Hernandez's story.

"I wanted to thank Congresswoman Mayra Flores for taking the time to even talk about my niece's story. She wants to help us get justice, as well," Rodriguez said.

San Antonio Crime Stoppers is offering a $5,000 reward for any information leading to an arrest in the case.

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Hernandez was about to graduate from Roosevelt High School in May. Her 18-year-old sister, Kaylee, died last year.

Any information leading to the identity of this person of interest, please contact the SAPD Homicide unit at 210-207-7635 and provide them with case number SAPD24055687.