Oh, you don't need to ask for my approval. You're the author; I'm just along for the ride.

Assuming there's no limit to the stories you want to write with one group of characters, another possibility would be to simply have Tracer or D.Va or even Mercy trying to catch Widowmaker, and a fight ensues resulting in the death of one of the woman involved. Bonus points for Tracer looking for revenge and getting it by hanging Widow to death, or failing and getting herself killed. (Yeah, I know they dont have to continue older stories; sequels are just fun sometimes, I think)

Alternatively, maybe Widow hangs herself because the struggle makes her feel alive, and she can last for a long time to enjoy it. Lesbian action with Tracer, Mercy, D.Va, etc optional.

Like I said, you're the author. Don't write because you think I want to see something. I'm just tossing ideas on the table. You run with whichever ones you like.