HOUSTON -- A 74-year-old man shot a teenager who tried to carjack him outside his home, police told KPRC Local 2.

Houston police said Martin Baltazar, 18, approached August Peters as he was getting out of a car at a home in the 10900 block of Corona Lane shortly before 7 a.m. Thursday.

Investigators said Baltazar, wearing a ski mask, put a knife to Peters' throat and told the man to hand over his keys.

Peters got back in his car, pulled out a gun and and fired twice -- hitting Baltazar once in the stomach, police said.

Detectives said Baltazar ran through a house across the street and tried to run through a back door, but it was locked.

"I see the guy running to my house, and I see a lot of blood on him. I told that guy, 'Stay there,'" witness Jorge Ramos said.

Baltazar picked up a chair, threw it through a window and jumped out the window, police said.

Ramos said the suspect took his pants off in order to get through the window.

He then jumped a fence and collapsed two blocks away on Carvel Lane near Wilcrest Drive, investigators said.

Baltazar was taken to Ben Taub Hospital in fair condition.

No one else was not injured.

Police said Baltazar could face an aggravated robbery charge.