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Was it her husband Michael, whom the prosecution targeted for his bisexuality and pattern of lies?

Was it an intruder who was never found human or avian?
Did Kathleen simply slip down the stairs?
as her assistant district attorney Freda Black describes Michaels cache of gay porn.

So which theories do the twoThe Staircaseseries cover?
How do they differ, and what do the re-creations provide?
1.Michael killed Kathleen via blow poke
1.

Both versions ofThe Staircasethoroughly cover this suggestion.
By not including it,The Staircaseessentially diminishes its validity.
2.Kathleen fell on her own
2.

But according to Michael, that was all there when he found Kathleen at the bottom of the stairs.
3.Michael and Kathleen fought, but her death was an accident
3.
She confronts him: I always knew, I think.

The men, the men, the men!
He slowly zooms in on Kathleens body and positions Michael as standing by while his wife dies.
A lot of viewers might be convinced by this one; I certainly was.

4.An owl did it
4.
The explanation got some coverage onDatelinewhen the newsmagazine tackled the case.
Michaels lawyer David poses as a theory in Chapter 12: Between Anger and Despair.

HBO MaxsThe Staircase, meanwhile, integrates this theory from the beginning.
Why have we anthropomorphized owls as cute and cuddly?
Zack SnydersLegend of the Guardians: The Owls of GaHoolewas right!

5.Former Michael Peterson hookup Tyrone Lacour did it
5.
If Lacour killed one ex-lover, why not another?
When Michael bumbles his way through, I lied about Dennis.

With one episode to go, this likely isnt the last well see of that tendency.
6.Michael Peterson is guilty of being an asshole
- she says to a commiserating Jean-Xavier.
Perhaps this failed romance explains the lack of the editors presence in the final episodes of NetflixsThe Staircasedocumentary.
Its hard to say how much fictionalization Campos is injecting here, but Binoches heartbroken performance is very effective.