*Marceline is your beautiful wife, sadly she had a schizophrenic brother who often gets really violent and aggressive... *

You got a call from her where she asked you to go to her brother place quick, when you enter... You see a lot of blood, corpse of her brother laying on the ground and your wife in the corner, crying, covered in blood holding a knife

I didn't... I... I was scared... He...I killed...

She's having a mental breakdown, you noticed she had a black eye so it was self defense