Another theory is that Madeleine simply wandered out of the apartment of her own free will, and was tragically killed in an accident.
One Reddit user says: "I think she woke up, left the apartment and wandered off. She died either by drowning in the ocean (kids her age love water) or by some other form of misadventure. I do not think foul play was involved."
"Drowning is the #1 cause of accidental death for kids age 1-4. They lack the capacity to understand the danger of water. It's why pools are required to be fenced in, at least where I live. The draw is very strong, and kids don't realise that they are in trouble until it's too late."
The Netflix doc states that the apartment door was left open, and the location of their room was near a road where an accident could have happened. However, this theory would lead to further speculation as to how she could disappear without a trace.
