The NorCal library shooter wrote “Natural Selection” in black marker on his white T-shirt in a bid to mimic the Columbine High School shooters, officials said Tuesday.

Bradley Scott Sayer, 18, allegedly shot and killed two people at a Butte County Library wearing the top, which cops said represented his obsession with the massacre.

Columbine shooter Eric Harris wore a similar shirt as he committed an atrocity at his Colorado high school in 1999. Butte County District Attorney Michael Ramsey said Sayer was a “fan” of the killing and ones like it.

“The suspect was a fan, and a fan for some time, of social media involving Columbine-type shootings, the school shootings, and had unfortunately a deep dive into that social media community, and obviously lost his way in that and decided yesterday to act in copycat,” Ramsey said.

Officials said Sayer first arrived at the library and did a walkthrough before he walked out to his car to retrieve a shotgun.

“He was looking for a confined, populated location to attack,” FBI agent Sid Patel said at a Tuesday news conference.

He allegedly shot first victim Jacob Hull, 46, in the leg as he was entering the library. Seeing Hull disabled from the shot, he fired at his head, killing him, officials said.

A juvenile female who was with Hull was injured. Sayer then entered the library and allegedly shot 74-year-old Robert Johnson in the head, also killing him.

Library staff heroically rushed the patrons of the building to safety, officials said, and Sayer allegedly fled the scene. Arriving law enforcement seized Sayer outside the building without any use of force, officials said.

The entire incident only lasted around four minutes from the first 911 calls to Sayer’s arrest, Chico Chief of police Billy Aldridge said. Eight rounds were fired, and the shotgun used was recovered at the scene.

Two other firearms were found in the suspect’s vehicle.

According to officials, Sayer alternated between living with his father and mother. Police believed he was inspired by the Columbine shooting because of the shirt he wore and interviews later conducted.

Sayer will appear in Butte County Superior Court on Thursday at 3 p.m. He’s expected to be charged with two counts of murder.

---

Download The California Post App, follow us on social, and subscribe to our newsletters