"There's too many imponderables in this law, whereas the previous law was working just fine," Warren Diepraam, the Harris County Assistant District Attorney, told ABC a few months ago. "Frankly, life is precious."
Even some of the law's supporters have said the law doesn't support Horn's actions.
Still Harris County District Attorney Kenneth Magidson stood by the grand jury's decision.
"I understand the concerns of some in the community regarding Mr. Horn's conduct," Magidson told reporters at the courthouse. "The use of deadly force is carefully limited in Texas law to certain circumstances. ... In this case, however, the grand jury concluded that Mr. Horn's use of deadly force did not rise to a criminal offense."
But Ortiz's and de Jesus' families and friends wanted to see Horn prosecuted.
"This man took the law into his own hands," Stephanie Storey, De Jesus' fiancee, told ABC News just after the shootings. "He shot two individuals in the back after having been told over and over to stay inside. It was his choice to go outside and his choice to take two lives."
With all the attention Horn's case has brought, he said his life has been difficult.
"It's been very traumatic. It's been awful. I'm scared to go somewhere people may recognize me," he said. "To be in a situation where you have to take two lives to save your own, you have no idea."
"No one wants to feel like I feel," Horn said.