Opening statements begin Wednesday in the trial of a Boston woman accused of causing a 2018 car crash that resulted in the death of a young pedestrian a toddler returning from the park with his nanny and sister.

Charlene Casey faces a single count of motor vehicle homicide connected to a July 2018 crash in which she is accused of striking a van, which then careened onto a South Boston sidewalk, hitting 2-year-old Colin McGrath and his 4-year-old sister.

McGrath, his sister and the nanny were returning from a wonderful day in the park, the family said in the toddlers obituary. The 4-year-old suffered serious injuries in the collision, including broken bones and a lacerated liver, but survived. Their nanny received minor injuries, prosecutors said.

After selecting a jury on Tuesday, attorneys representing Casey and the commonwealth will begin their opening statements on Wednesday, the Suffolk County District Attorneys Office said.Read more: Full of love, laughter, curiosity; Family remembers 2-year-old Colin McGrath who died in South Boston crash

Two-year-old Colin McGrath was killed in a chain-reaction car crash in South Boston in July 2018. (Suffolk County District Attorney's Office)

Prosecutors will argue that Casey initiated the crash that caused the young boys death. Casey was behind the wheel of a Toyota Prius on July 25, 2018 when she stopped at a stop sign at the corner of East Sixth Street and L Street in South Boston before accelerating into the intersection and hitting a van that did not have a stop sign, according to the district attorney.Read more: South Boston says goodbye to Colin McGrath, 2-year-old killed in crash

The van which investigators said had its steering damaged in the collision jumped the sidewalk and struck McGrath, who was being pushed in a stroller, and hit his sister and their nanny, according to the district attorney.

When Casey was indicted on the motor vehicle homicide charge, the district attorneys office said she had failed to yield the right of way to the van.Read more: The saddest thing; Family enters church in tears for funeral mass of 2-year-old Colin McGrath

The crash prompted an outcry for pedestrian safety in the neighborhood. In the two months after, the Massachusetts State Police and Boston Police Department issued around 500 traffic citations in the area, most for crosswalk violations, speeding and other unsafe driving behaviors, according to state police.

McGrath was remembered for his laughing eyes, beautiful curls, hilarious voice, and sense of adventure, his family wrote in the obituary.

His life was full of love, laughter, curiosity, and learning. Always playing, singing, dancing, and asking questions; Colin lived every minute of his brief time with us to the fullest, they said.