An avowed white supremacist pleaded guilty on Monday to first-degree murder and other state charges in a mass shooting that killed 10 people in May at a supermarket in a predominantly Black neighborhood of Buffalo, New York, local media reported. At a hearing at Erie County Court, Payton Gendron, 19, pleaded guilty to multiple counts related to the shooting, which also left three people wounded. In June, he initially pleaded not guilty after a grand jury returned an indictment. Gendron, from Conklin, New York, was initially charged with 10 counts of first-degree murder and 10 counts of second-degree murder, all...