First episode I think was a suicide. The dude seemed obsessed with movies and I think he was depressed after striking out in Hollywood and having to move across the country to take some bullshit job from his friend. It seemed like the wife was the breadwinner there which, internally, the guy probably found humiliating coming from a Puerto Rican background which is very patriarchal. Even if someone seems completely fine... you never know what's going on inside their mind.
Second one is tough. I kind of lean toward the husband having something to do with it because he's clearly a total piece of shit and it seems he went out of his way to create himself an alibi the day she went missing. It could just as likely be a random opportunist though.