Man kills himself in Houston airport with suicide note saying: "The monster within me was getting stronger and while I could not save myself I could spare others."

Before Carnell Marcus Moore opened fire Friday at Houston's busiest airport, he wrote out a chilling suicide note.

“The monster within me was getting stronger and while I could not save myself I could spare others," the 29-year-old shooter was quoted as writing, according to the Los Angeles Times.

The Beaumont man's suicide note was found in a black rolling suitcase also containing a loaded AR-15 rifle and a Gideon Bible, according to the Associated Press.

"'Here in the last hour, I yield to mercy when this could have turned bad,'" Moore said in the signed note, according to Department of Homeland Security Special Agent Brian Harris.

The Houston Chronicle details Moore's final days, in which he kidnapped a woman with whom he worked at an apartment complex.

A HPD official told the paper that he had become infatuated with the woman but had no romantic relationship with her. That woman was able to convince Moore to let her go.

Moore's left other disturbing messages on his Facebook page.

"45 minutes and 59 seconds in God's Shadow and Time Stops," Moore wrote on Thursday.

"This Life Will Crash Tomorrow!" he wrote on Wednesday. "I recently had the chance of staring death in the face, and she was beautiful"

Moore shot himself in the temple with a 40-calliber semi-automatic pistol. Police opened fire after he fired twice into the ceiling. Moore was struck in the shoulder by gunfire, before he turned his weapon on himself, according to the AP.