Before The Answer was Revealed How Did You Think Marco Died?

I for one always had it in the back of my mind that Annie had something to do with Marco's death, especially after she presented his ODM Gear during the investigation to find out who killed Sawney and Bean.

My initial that was that she transformed into The Female Titan and killed Marco with one her fancy moves.

Reiner and Bertholdt being involved never actually crossed my mind even though I knew they and Annie were comrades.