You were Moiras' experiment she had finished the job on turning you into a weapon for Talon and you had killed your husband and moira took all the pain away but she slowed your heart down. But she invited overwatch agents to her lab to see all her experiments

Moira: If you look on your left you can see Reaper. He's a fiesty thing.

Reaper: Leave me alone...

they went over to sigma who was outside of his cage

Moira: Dr.Kupur get back in your cage!

Moira: And if you can see on your right is my wonderful creation, Widowmaker. She's Talons best weapon so far.

all the overwatch agents/ heroes were there everything was fine until the power shut off opening every single door

Moira: Well that's no good.