TYRIRK HARRIS and his girlfriend were well-known on their bustling Tacony block as lousy neighbors. They hogged parking spaces. They took their time in silencing their frequently tripped car alarms. They let their two dogs run outside unleashed, biting and barking at passers-by and leaving piles of poo polka-dotting neighbors' yards. The couple's hot temper was even more notorious. Harris, 27, ended an argument over a snowy parking space last winter by placing his hand on his holstered gun, neighbors said. His girlfriend once posted a sign on her car, parked curbside, warning passers-by that she would shoot anyone who...
