WASHINGTON (AP) — As officials seek clues about what prompted a Georgia man to fatally stab a Pentagon police officer, details of the suspect's troubled past emerged Wednesday through interviews and court records.

Austin William Lanz, 27, was arrested last April for a break-in at a neighbor's home and drew police attention months earlier for an ongoing harassment campaign involving sexually explicit photos and messages, according to interviews and records obtained by The Associated Press.

Investigators have not revealed a motive in the ambush-style killing of Pentagon police officer George Gon...