The Dayton mass shooting suspect was reportedly kicked out of high school for making “hit lists” of students whom he wanted to rape, kill and skin.

Connor Betts, 24, allegedly wrote the lists on a bathroom wall and in a notebook, which was recovered by school officials.

He was suspended, but eventually was allowed back at Bellbrook High after writing a letter of apology to his proposed victims, according to Dayton 24/7.

Betts’ former principal, Chris Baker, confirmed his suspension to the Dayton Daily News — saying, “I would not dispute that information.” He refused to speak further on what happened.

“I don’t want to get involved any more than just making that comment,” Baker told the local paper.

A former classmate, who spoke on the condition of anonymity, confirmed the existence of Betts’ notebook with Dayton 24/7. Another person who attended Bellbrook High School with him said she remembered his hit list vividly.

“I guessed it might’ve been him just from that list,” said the woman, who also refused to be identified.

“I know he made the list,” she added. “He had a plan to shoot up the school.”

Another former classmate, who also spoke on the condition of anonymity, claimed Betts had violent fantasies — including one that involved tying her up and slitting her throat.

“He knew it wasn’t normal,” the woman said. “He and I talked at length about him getting help.”

The first alum said Betts had been bullied in high school, but eventually seemed “pretty normal” after getting “some help.”

Another person who went to Bellbrook with the young man described him as “a little bit of an oddball.”

“He had a dark sense of humor — jokes about dying,” Demoy Howell told the Daily News. “He would wear all black. I remember sensing a dark energy around him.”

Howell added, “There was a lockdown one year and it was because he wrote something in the bathroom. Then he kind of fell off the face of the Earth. I don’t remember him walking (at graduation).”

Like the other former student, Howell later sensed a change in Betts while working with him at a local fast-food spot.

“Generally there was no issue,” Howell said. “He kind of kept it together.”

Describing Betts’ rampage, Howell said: “I think this is less of a hate crime and more of an ‘I hate everybody’ crime. I honestly feel more comfortable now knowing that he’s gone.”

Nine people were killed and more than two dozen wounded in the early Sunday slaughter, which took place just hours after a 21-year-old Texan fatally shot 20 people and injured 26 others at a Walmart in El Paso. Betts was shot and killed by police.