Given the circumstances (MR last to see DR, some vagueness about their last hours together, ER's accusation, etc.), I can totally understand the speculation that MR accidentally killed DR in a rage or that MR somehow died in DR's care (perhaps as a result of MR's negligence) and MR covered it up. I am baffled, however, by the speculation that MR pre-meditatedly killed DR when there is literally no evidence to suggest that he would ever do such a thing. Intentionally and pre-meditatedly killing one's own child (absent mercy-type circumstances) is incredibly rare (especially for men, actually -- though the statistics for moms normally relate to very young children) and a far cry from being a bit of a deadbeat dad.