Justin Bonner will be sentenced on Thursday for kidnapping a Cumberland Farms employee in Shelton in 2010.
He admitted to the kidnapping and said he was high at the time, according to court papers.
"I cannot believe I did this," the Stratford man said in a written statement for police. "I was high on Angel Dust at the time."
Surveillance video shows Bonner entering the store three times. On the third visit, he "bear-hugged" the clerk and pulled her outside, forced her into the trunk of his car and beat her in the head with cans of soda, police said.
Officers found her a couple miles away from the store after she knocked on a resident’s door and asked for help.
The victim, a 46-year-old woman, did not recall how she escaped, according to the affidavit.
"I am sorry I did this. I will pay for her medical expenses. I'm so sorry," Bonner wrote in a statement.
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Doctors at Yale-New Haven Hospital counted three areas in the victim's brain where she was bleeding after the attack.
Bonner was charged with first-degree kidnapping and first-degree assault. He was convicted of third-degree assault less than two months earlier and served no prison time.
He agreed to a plea deal and is expected to serve 35 years in prison.
Bonner had been placed on suicide watch because of what the judge called verbal self threats.