The University of Connecticut student accused of killing two people and wounding another scrawled bizarre messages on the wall of his off-campus apartment, referencing the Sandy Hook massacre.

“I’m not angry . . . I’m upset,” read foot-tall letters scribbled over a door in Peter Manfredonia’s room, according to photos taken in July 2019 and now circulating on social media.

Nearby, a haunting checklist written in red reads:

“Is this bad?”

“Will I get in trouble?”

“Will they look at me strange?”

“Problems and fears are the only two things that need to be confronted!!!!!”

Another scrawl references the 2012 Sandy Hook elementary-school massacre carried out by Adam Lanza — who lived on the same block as Manfredonia in Newtown.

The message, which is too small to decipher, is signed, “#Sandy Hook Promise” — an apparent reference to the advocacy group founded by families of the massacre’s victims.

Manfredonia had written last year about competing in a triathlon for the charity to help raise funds. Alan Barry, a Danbury attorney whose law firm represents the anonymous cooperating Witness No. 1 in the state and federal cases against Manfredonia, said the messages were disturbing.

“I have no professional credentials to draw an opinion,” Barry said of Manfredonia’s scribbling. “The only thing I can draw on as a human, as an observer of human nature, I can say that what appears in this image is the writings of somebody who is profoundly angry and disturbed.

“If it turns out that he did commit these crimes, this is someone who is capable, on some immeasurable level, of monstrosity.”

Not seen in the photo is a note written on the wall and reported by the South Passaic Daily Voice this week.

“We saw what happened when Adam snapped,” the message said in a suspected reference to Lanza, who gunned down 26 innocent people — including 20 first-graders.

“Now they see what happens when I snap.”

Manfredonia is accused of killing Ted DeMers, 62, and a former classmate, 23-year-old Nicholas Eisele, before going on the run last week.

He was nabbed by authorities Wednesday in Maryland.

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He waived extrication to Connecticut and had yet to be arraigned Thursday evening, the Connecticut Post reported.

Barry said his client has provided investigators with valuable information on the case.

“The information that he has provided to law enforcement has been actionable with regard to people, places, and law enforcement has now dealt with the information that he has provided them.”