Maine’s supreme court has rejected the appeal of a man convicted of manslaughter in the death of a 6-month-old-boy in Millinocket.

Jessee Mackin is serving a 5 1/2-year sentence for the death of Larry Lord Jr., who was the son of his girlfriend. Mackin was living with the baby’s mother in Millinocket at the time, in 2015.

The baby, Larry Earl Lord, died after being brought unresponsive to a hospital. The Medical Examiner’s Office determined the infant died of a skull fracture.

In his appeal, Mackin contended the evidence was insufficient to convict, but the supreme court unanimously upheld the conviction on Tuesday.

The baby was the son of Anthony Lord, who’s serving two life prison sentences for a shooting rampage that claimed two lives and injured four others in 2015. Lord said he was overcome with grief over his son’s death before the shootings.