A Texas man is urgently seeking information to discover the fate of his 24-year-old daughter, who has been missing for several weeks.

Houston police have reported that Sydney Marquez was last seen on December 11 in the Chinatown area of southwest Houston, specifically near a shopping complex located in the 9100 block of Bellaire Boulevard.

According to KHOU 11, security cameras captured Sydney on the day she disappeared, walking along a sidewalk heading north on Ranchester Drive.

“She seemed to be walking normally, not distressed or hurried. It looked like an ordinary walk,” explained Tim Miller from Texas EquuSearch.

Raul Marquez, Sydney’s father, expressed concerns that potential witnesses from the area, which is culturally diverse, might hesitate to come forward due to worries about their immigration status.

“If you see my daughter, if she’s in danger, please don’t remain silent,” Raul Marquez implored. “If you notice anything or have any information, please speak up. I miss my daughter dearly. She needs to come home.”

“They may be scared to reach out because of their immigration status. But if you see something, if you know something, please say something.”

Chron reports that Sydney had traveled from El Paso to Houston, to meet up with a friend. She left behind her phones, makeup, and clothes, inside her abandoned car in the Southwest Houston neighborhood.

Family members said Sydney suffers from mental health issues had been off her medication when she walked away. Her father said she has wandered off before.

At least one friend has been questioned and is said to have been cooperating with authorities.

“He was 100 percent cooperating and the father and him actually went to HPD and really questioned him and everything, I think they did everything that was necessary to do,” Miller told KHOU.

Sydney recently graduated from Texas A&M with a degree in neuroscience. She’s described as standing 5 feet, 4 inches tall and weighing around 120 pounds. She has short reddish, brown hair, wears glasses and has a four-leaf clover tattoo on her left wrist.

Houston police are urging anyone with information to contact them at 832-394-1840 or Texas Equusearch at 281-309-9500.

Check back for updates.

[Feature Photo via Houston PD]