Honolulu police said today they have released the 26-year-old Waimanalo woman who was arrested late Monday night in a hit-and-run collision that killed an 8-month-old boy.

The infant’s 3-year-old brother and his 24-year-old mother were also seriously injured.

Police released Annie Akau on Tuesday night. She initially was arrested on suspicion of negligent injury, operating a vehicle under the influence of an intoxicant, driving without a license, endangering the welfare of a minor and other offenses.

The negligent injury offense was changed to first-degree negligent homicide upon the death of the baby on Tuesday.

Police said speed and alcohol appear to be factors.

Akau was driving a Chevy S10 pickup truck, heading toward Makapuu on Kalanianaole Highway at about 6:46 p.m. Monday when the truck hit the family in a marked crosswalk near Oluolu Street in Waimanalo, police said.

The mother was pushing a stroller with the baby, Donovan Naleieha, inside. The truck stopped roughly 60 feet past the crosswalk with the stroller underneath. The baby’s father was behind them.

Police said Akau had her young child with her in the truck, and fled the scene on foot. Her husband, 38, arrived at the scene and was arrested on suspicion of hindering prosecution.

The truck also sideswiped a car, whose driver had stopped for the family to cross, police said.

Police said they identified Akau from video surveillance obtained from the 7-Eleven.