It’s been almost three weeks since an armed robber shot and killed a teenager at a Subway restaurant in southeast Houston.

Javier Flores was working with his mother when two men tried to rob the sandwich shop near Broadway and I-45. The Chavez High School student was shot while trying to protect his mom.

“I have the (shooter’s) image in my face, because he was right in front of my face. I’m just looking around to see if I see that person,” said Hilda Vasquez, Javier's mother.

Police released a suspect sketch as well as surveillance video showing the two suspects rob another Subway just 30 minutes after the murder.

Suspect sketch, surveillance video released in fatal shooting of teen

Investigators say they’re still sorting through leads from tips that have been called in.

Even so, the teenager’s parents say they’re frustrated no one has been arrested.

“I do feel frustration, because I know there are people that know these guys out there in the streets," said Javier Vasquez, the victim’s father. "Even though they know they did something wrong, they’re not going to turn them in. Why? We don’t know,. It doesn’t make you a coward because you snitch or tell on somebody. That makes you a man.”

Father of murdered Subway worker makes plea to killer

The family hopes seeing their pain will move someone do the right thing.

If that isn’t motivation enough, activist Quannel X announced he’s adding $2,000 to the $40,000 reward being offering by Crime Stoppers.

Anyone with information can contact Crime Stoppers at (713)-222-TIPS.