Austin police are asking witnesses for help in a New Year's Day fire that killed a Round Rock High School student, according to a statement issued Monday.

The teen, 18-year-old Kennedy Ikeena Obilom, died from his injuries Jan. 19 at Brooke Army Medical Center in San Antonio, police officials said.

Last week, school officials said Obilom and three other Round Rock high school students were injured about 6 a.m. Jan. 1 while trying to help a stranded motorist near East 10th Street and Interstate 35 in Austin.

A preliminary investigation shows the GMC truck the teens were in stopped at a gas station to put gasoline in a container, police said. A passenger inside that vehicle then tried to light a cigarette, igniting the fire, police said.

Another teen was also taken to Brooke Army and has survived, police said.

Austin police ask anyone with information regarding this incident to call detectives at (512) 974-8212.