A woman riding a MARTA train in Atlanta was killed in a brutal daytime attack Saturday, suffering nearly 20 stab wounds in what investigators say was a seemingly random act of violence, according to the NY Post.

Police allege that 25-year-old John Elijah Matthews approached 66-year-old Margaret Swan after boarding the train Saturday morning. Surveillance video reportedly shows him lingering near Swan before pulling out a knife and attacking her. According to court documents, Swan cried out and attempted to get away, but the suspect allegedly restrained her and repeatedly stabbed her.

Investigators say the assault continued as the train neared Oakland City Station. Matthews allegedly forced Swan to the floor and remained over her while she lay gravely injured.

The NY Post writes that after the attack, authorities say the suspect exited the train carrying the knife, leaving Swan motionless inside the rail car. Responding officers and emergency personnel tried to save her, but she was pronounced dead. The knife believed to have been used in the attack was later recovered.

Witness descriptions helped MARTA police quickly locate and arrest Matthews on the station platform shortly after the incident.

In a statement, MARTA officials described the killing as a senseless tragedy and extended condolences to Swan’s family, as well as those who witnessed the violence firsthand.

The fatal stabbing came just days after another passenger was attacked at Georgia State Station, raising fresh concerns about safety across the transit system. Some riders argued that recent changes to fare collection have made it easier for unauthorized individuals to access trains and stations, though officials have not linked the policy to either incident.

Matthews, who reportedly has no fixed address, remains in custody at the Fulton County Jail. He has been charged with felony murder and was scheduled to appear in court Monday.