Officers arrested 46-year-old Damian L. Pate and found the cache of weapons in the basement of a home at 3127 Pennsylvania Avenue, authorities said.

Kentrell Keith, 17, was fatally shot Sept. 3 in an alley in the city's Benton Park West neighborhood. St. Louis police were called to the scene that day about 3 a.m. for a report of a person down ...