Violence over the weekend claimed two lives in Charlestown and Brockton, local authorities said Sunday.

In Brockton, police responded to a 911 call from a family member reporting a man stabbed on Foster Street at about 1:55 a.m. Sunday, Plymouth DA Timothy Cruz’s office said.

Brockton Police and EMS responded to the scene, finding a man suffering from multiple stab wounds, the DA said.

The victim, identified as 19-year-old Kyre Ambrose, was taken to Good Samaritan Hospital, the DA’s office said. He was pronounced dead from his injuries by medical personnel.

Brockton Police investigated with assistance from the Massachusetts State Police detectives with the DA’s office. The investigators “canvassed the area and reviewed surveillance video,” the DA said, finding “probable cause” to arrest 18-year-old Jayden Fernandez.

Fernandez was being treated for a hand injury at Newton Wellesley Hospital when he was found by state police troopers, the DA said. He was taken into custody at the hospital.

The DA’s office said the investigation in that case remains ongoing.

Fernandez is scheduled to be arraigned on a murder charge on Monday in Brockton District Court.

The night before in Boston, police received a report of a pedestrian struck in Charlestown, Boston Police said.

At about 10:33 p.m. Saturday, BPD stated, officers responded to a parking lot at 140 Main Street in Charlestown, finding an adult man lying on the ground.

The responders determined the victim had been shot, BPD said, and Boston EMS pronounced the victim dead on the scene.

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The incident is under active investigation by Boston Police Department’s Homicide Unit. Anyone with information is urged to contact BPD at 617-343-4470 or anonymously through the CrimeStoppers Tip Line at 1-800-494-TIPS or by texting the word “TIP” to CRIME (27463).

The Boston Neighborhood Trauma Team also provides a free, 24/7 private support line at 617-431-0125 for anyone looking to talk to someone after distressing events in the community.