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Investigators say the now-deceased gunman who opened fire at a Nashville, Tennessee, high school on Wednesday, killing a female student and injuring another student before turning the gun on himself, was "significantly influenced" by web-based material found on sites "most would find harmful and objectionable."

On Wednesday, Metropolitan Nashville police identified 17-year-old Solomon Henderson as the shooter at Antioch High School who killed Josselin Corea Escalante, 16, and injured a 17-year-old student who suffered a wound after being grazed by a bullet. The latter has since been treated and released from the hospital.

In a news release on Thursday, police said the investigation into the murder-suicide inside the school’s cafeteria determined that Henderson fired 10 shots from a 9 mm pistol within 16 seconds after entering the room.

The handgun, police said, was loaded with nine rounds when it was recovered by investigators. A magazine loaded with seven rounds was also recovered from the cafeteria floor.

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Just prior to entering the cafeteria, the investigation found, Henderson went into a nearby restroom where he posted photos to social media.

Police previously believed Henderson took a bus to school on Wednesday, but they have since confirmed that his mother drove him to school.

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When investigators searched Henderson’s residence, they were not able to find any other firearms or gun parts.

While no firearms were found, detectives have since found two documents they believe were created by Henderson on non-traditional websites – one was 51 pages, the other was 288 pages.

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The documents and other evidence found at the residence, police said, are being closely looked at by homicide unit detectives as well as detectives from the Specialized Investigations Division and the FBI.

"It is clear that Henderson was significantly influenced by web-based material, especially that found on non-traditional sites that most would find harmful and objectionable," police said.

Additionally, it was learned the pistol was purchased by an individual in Arizona in 2022 and had not been reported stolen. 

The Bureau of Alcohol, Tobacco, Firearms and Explosives is helping police determine how Henderson acquired the handgun.

Fox News Digital's Greg Norman and Christina Shaw contributed to this report.

Kentucky’s legislature is primed to consider a bill in the new year that would make parents responsible for their juvenile child committing a crime involving the discharge of a firearm.

State Rep. Kim Banta, R-Erlanger, modeled her legislation after similar laws that hold parents accountable for property crimes and motor vehicle accidents.

In the Bluegrass State, parents are liable for up to $2,500 in cases where their kids deface property and the guardian who signed a minor’s driver's license application is "jointly and severally liable" for any findings of negligence or damage behind the wheel.

"The most important thing is that I am absolutely not trying to stop gun sales or enact gun control," Banta told Fox News Digital in a Friday interview.

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"I'm simply trying to make parents aware that whether it is driving a car or doing anything else their child does, they need to know what they’re doing, and they need to exercise caution."

Similar to the language in the car-crash law, Banta’s bill imputes "negligence or willful misconduct" of a minor on their parents/guardians for civil damages stemming from injuries to another person that are caused by a person with a gun.

Factors in determining parental liability include whether the elder allowed the child to have the gun, was aware of previous gun law violations or believes the minor to have the propensity to be violent, according to the Lexington Herald-Leader.

On Friday, Banta said there had been a recent case in Kentucky where several 15-year-olds got into a disagreement, purportedly over drugs, and one boy went home, retrieved a gun, and came back and shot the two other youths.

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"A 15-year-old does not have the mental ability to make snap decisions that adults do; not in anger, not in routine life, so a gun in their possession unsupervised is a little different than an adult with a gun," she said.

Foster parents, however, would be exempt from the law, according to Murray State University’s NPR affiliate.

The bill will be presented in January and Banta said if it makes it to a committee vote, there is a high likelihood it will make it to a full floor vote and be sent to Gov. Andrew Beshear’s desk.

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Fox News Digital reached out Beshear for comment but did not receive a response by press time. 

Both legislative chambers in Frankfort are held by Republican majorities, while Beshear is a Democrat.