MANCHESTER – Just days after a Superior Court trial jury returned guilty verdicts on eight of the 12 felony assault charges accusing him of inflicting multiple life-threatening injuries upon a former partner in early 2018, Gabriel Chalpin, 44, learned he will be spending at least 20 years in State Prison.

Chalpin, a former Massachusetts resident who lived in West Newbury and also in Methuen, was taken into custody on Feb. 7, 2018, on one count of first-degree assault. But as police investigated, the list of charges grew to a dozen, to include four counts of first-degree assault, felonies, and eight counts of second-degree assault, also felonies.

After Chalpin’s jury trial, which took place the week of March 18 in Hillsborough County Superior Court-North, the jury convicted him on two first-degree assault charges and six second-degree assault charges. Members found him not guilty on the remaining four charges.

According to police reports at the time, the spate of violence that led to Chalpin’s arrest was as lengthy as it was violent.

Police said he attacked the woman in her Amherst home and punched her “throughout the house and throughout the night,” delivering blows the woman described as “too numerous to estimate,” according to the reports.

Chalpin, who was indicted on the charges two months later, was accused of fracturing the woman’s spine, ribs and nasal bone, and “causing traumatic pneumothorax (the collapse) of her lung” by striking her with his hand, according to the indictments.

Other indictments accuse Chalpin of “recklessly” causing bodily injury to the woman, and allegedly doing so “under circumstances manifesting extreme indifference to the value of human life.”

Amherst police said in their reports that a Manchester officer working a detail at a Manchester hospital contacted them after seeing the badly beaten woman enter the hospital’s emergency department.

When an Amherst officer arrived, he found the woman “reluctant to give any information, as she was scared,” the reports state. She eventually gave the officer the name of a man who died in 2012, along with a phone number that later led police to Chalpin.

Eventually, police said, the woman “opened up” some, telling the officers that she and Chalpin had gone to a movie the previous evening, and when they got to her residence she went to bed.

She said she awoke to Chalpin allegedly “arguing with her about topics she could not even remember,” police stated. He allegedly “would not allow her” to go outside to have a cigarette. Then, a short time later, he allegedly “began to hit her with his closed fists,” according to the reports.

The woman recalled being seated, standing, and “on the ground in a fetal position” at different times during the alleged assaults, police said.

She told police that once Chalpin left the residence early the next morning, she went “to get herself the medical attention she needed.”