Los Angeles investigators accuse Aramazd Andressian, 35, of murdering his 5-year-old son, “Picqui,” in revenge against his ex-wife because of their divorce battle. Andressian’s lawyer, who said his client would plead not guilty at his arraignment Monday, accused police of a “rush to judgment.” The search for Aramazd Andressian Jr., known as Picqui by his …