THE suspect behind the Lewiston mass shooting knew how his killing spree would end, according to a forensic psychologist.

Robert Card who is thought to have killed 18 people in two separate attacks on Wednesday night was found dead by Maine State Police on Friday evening.

The 40-year-old died from a self-inflicted gunshot wound in a trailer at Maine Recycling in Lisbon where he may have recently lost his job.

During the 48-hour manhunt for the suspect, cops found a note addressed to a relative which contained his cell phone password and bank account information.

Forensic Psychologist Katherine Ramsland wrote about Card’s potential motive and victimology in Psychology Today.

Defining him as a “spree killer” Ramsland said: “Card killed himself afterward. Apparently, he was done.

“From his note, he seemed to know before he started that this was how it would end.”

While not being described as a suicide note, Maine Commissioner of Public Safety Michael Sauschuck said that the “tone and tenor” was that Card knew he would no longer be around.

“That’s not uncommon in suicide situations,” Sauschuck said.

Ramsland from DeSales University has worked with a former FBI profiler to develop a database on spree killers and classifications.

They define spree killing as “at least three murders in at least two locations, arising from a key precipitating incident that continually fuels the need to kill, and the murders occur fairly close in time.”

Card opened fire at the Just-In-Time Recreation bowling alley and then traveled four miles to do the same at Schemengees Bar and Grille.

Ramsland noted that, while his motive has not yet been established, “the job loss and the report of hearing voices suggest desperation or mental illness.”

She added that many spree killers who end their own lives following their attack are classed as being in the “Desperation category” or “Mental Illness” category.

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Sauschuck said: “I think clearly there’s a mental health component to this.”

It was previously reported that Card may have been committed to a mental health facility over the summer.

However, Sauschuck said there is no evidence to support that claim.

“We have not seen to this point that Mr. Card was forcibly committed for treatment,” Sauschuck said.

Law enforcement previously revealed that Card was a certified firearms holder.

Card has previously been accused of threatening to carry out a shooting at a National Guard base in Saco, Maine.

Cops also said that he had claimed to have previously heard voices.

A U.S. official, who wished to remain anonymous, told The Associated Press that Card had been evaluated for erratic behavior in July, per the Lewiston Sun Journal.

Katie Card, the suspect’s sister-in-law, told NBC: “He was picking up voices that he had never heard.

“His mind was twisting them around. He was humiliated by the things that he thought were being said.”

Military records seen by NBC have revealed that Card enrolled in the Army Reserve in 2002.

He had no combat developments.

In total, 18 people have died and 13 more were wounded between both locations in what is America’s deadliest gun rampage of 2023. 

The 18 victims have now been identified as Peyton Brewer-Ross, 39; Ronald G. Morin, 55; Tommy Conrad, 34; Michael Deslauriers II, 51; Bryan MacFarlane, 41; Arthur Fred Strout, 42; Joseph “Joey” Walker, 57; Joshua Seal, 36; Tricia Asselin, 53; Maxx Hathaway, 35; William and Aaron Young, 44 and 14, respectively, Robert “Bob” Violette and his wife Lucy, 76 and 73 respectively; Jason Adam Walker, 51; Keith D. Macneir, 64; William Frank Brackett, 48; and Stephen M. Vozzella, 45.