BANGOR, Maine — The Millinocket man arrested late Wednesday in connection with the death of a 6-month-old boy last year has a history of violence, including domestic violence assault and violation of a protection order, according to state records.

Jessee Mackin, 33, was arrested hours after he was indicted by a Penobscot County grand jury on a charge of manslaughter related to the death of Larry Lord Jr., the son of his girlfriend, Stephen McCausland, spokesman for the Maine Department of Public Safety, said earlier.

Mackin, who is being held at Penobscot County Jail, is scheduled to appear Friday afternoon at the Penobscot Judicial Center.

According to a criminal history that the Bangor Daily News obtained Thursday from the State Bureau of Identification, Mackin’s convictions date back as far as 2003, when he was found guilty of criminal mischief.

In 2004, however, he was convicted of domestic violence assault and later that year violating a protection order and assault, his criminal history shows.

The next year, Mackin again was found guilty of violating a protection order in connection with a domestic violence incident. Assault and criminal threatening charges filed against him at the time were dismissed as part of a plea agreement.

Mackin’s most recent conviction in Maine was in 2006, when he was found guilty of assault.

State records do not include details of the individual incidents. The records indicate that the longest jail terms Mackin served for any of his convictions were two 60-day sentences, the first for the domestic violence conviction and the second for assault and violation of a protection order.

Wednesday’s manslaughter charge stems from the May 2015 death of Larry Earl Lord, the 6-month-old son of accused murderer Anthony Lord.

The infant was taken to the Millinocket hospital on May 5 and died at Eastern Maine Medical Center in Bangor on May 7, according to previously published reports.

“The baby died at the hospital after being brought there unresponsive by his mother in May, and State Police have been investigating the death since that time,” McCausland said.

Larry Lord is survived by his parents and four sisters, according to his obituary. The Jesse [sic] Mackin family is also listed among the survivors.

It was not immediately clear if the rampage involving Anthony Lord on July 17 was related to the death of his son two months earlier.

The child’s death was mentioned in several BDN stories about the shooting spree, which left two men dead.

Jamie Clark, the mother of Larry Lord, said during an interview with the BDN in July 2015 that Brittany Irish, the woman allegedly kidnapped by Anthony Lord amid the shooting spree, “came into my son’s funeral holding hands [with Anthony Lord].”

Irish said in July that she formed a friendship with Anthony Lord and was at the boy’s funeral to support him because “I had a miscarriage at the same time that his son died.”

The nature of the relationship between Clark and Mackin was not mentioned in previous stories.

Anthony Lord, who has a long criminal history and is a lifetime registrant of the Maine Sex Offender Registry, was arrested after a July shooting spree and manhunt that resulted in the deaths of Kyle Hewitt, 25, of Bangor and Kevin Tozier, 58, of Lee.

Lord is awaiting trial after entering a not guilty plea to the charges against him.

BDN writer Nok-Noi Ricker contributed to this report.