HOUSTON – A teen worker was shot and killed in front of his mom during an armed robbery at a Subway restaurant Wednesday evening, police in southeast Houston say.

Police released a sketch of one of the wanted suspects Thursday afternoon. Police believe the suspect pictured was the shooter. Both suspects are described as two young black males.

The victim, 18-year-old Javier Flores, was a student at Chavez High School. He was working at the restaurant in the 3900 block of Broadway around 8 p.m. Wednesday when he was shot in the neck by one of the two suspects during a robbery.

On Thursday evening, Crime Stoppers announced that the reward has been increased to $30,000 for information on who killed Javier. Anyone with information that may lead to an arrest or charges should call Houston Crime Stoppers at 713-222-TIPS.

HPD Homicide detectives say the two suspects in the robbery and murder of Flores struck another Subway location thirty minutes later. The Subway at 4807 San Jacinto, just eight miles away, was robbed as well. In that robbery, no one was injured and the suspects were caught on surveillance video.

RAW: Surveillance video shows shooting suspects inside Subway

Javier's father Carlos Vasquez says his son was a hero and dedicated son who gave his life for his mother.

"He got between them and he pushed her," said Vasquez. "When he pushed her the guy pressed the trigger. When he run, running to grab the phone to call police, the other guy jumped over counter and told him 'get him' that's when he got shot a second time."

Vasquez is pleading with the public to help catch his son's killer.

"They're out there, you're going to pay for it," said Vasquez. "If the law don't find you, we're going to find a way."

KHOU11 News spoke to some of Flores’ friends at the campus today.

“He was a good, really good friend,” said Helizander Rodriguez. “He took a bullet for his mom.”

Police said the victim's mother was working in the restaurant as well when the suspects walked in.

"During the robbery, it appears the black males entered the store, pointed a gun at a female employee who ended up being the victim's mother. (The victim) tried to intervene and when he confronted the guy with the gun, he was shot,” HPD Det. David Crowder said.

Emergency responders with the Houston Fire Department rushed Flores to Ben Taub Hospital but he did not survive.

Police said they don't know if anything was taken in the robbery.

The suspects fled the scene in a four-door, gold colored sedan and traveled southbound on the Interstate 45 feeder road.