"He was probably watching her, stalking her the whole time," one of the victim's siblings also said the suspect had a crush on her, but she didn't feel the same.
The alleged shooting in Cypress happened earlier this month, but this may not have been the first time the teen shot his neighbor.
"I feel unsafe sometimes when I let my dogs out," one neighbor said. "It was such a great neighborhood, and I'm not sure what's changed."
According to the Houston Police Department, the man was leaving the building when two men walked up to him and tried to rob him.
In one case, the suspect shot and killed a victim whose car was broken down after offering to help, according to deputies.
SHOCKING TWIST: New charges against cadet after investigation into accidental shooting.