The man who allegedly shot and killed a 20-year-old Boston man last night at 20 Memorial Road was arrested at his Roslindale home today, according to a source close to the investigation.

Both the victim and the suspect are 20-year-old males from Boston, the source said. Marcus Amos shot Keith McCoy in the chest and neck, the source said. Detectives developed and pursued leads last night and today that led them to arrest Amos at his Roslindale home on a murder warrant, the source said.