Seems more than child support, who knows if she even brought it up. He seems very earlier on to hate having kids. Would like to know his background.
I think maybe because we spend time on this forum, some of the things that seem obvious to us not obvious to the criminals or maybe they are so focus on killing the person they don't pay attention.
Like saying you haven't spoken to her in years when you texted her the day she went missing do they not know they can check phone records? Or parking where there is a surveillance camera.
Then again the smart ones know better and never get caught.
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I hope his GF had no ideas of his plans, she must have been suspicious after the fact though. Now he can continue the relationship behind bars. If I was her I would not speak to him ever again.