i wouldnt have killed the snake. i'm not scared of them. but i understand. your living room, your rules.
possum. we had shades on my kitchen windows at my old house. had to put them in because my idiot neighbor keeps leaving on his side light. well, one night is see the silhouette of the biggest rat (walking along the top of fence) shadowed on my blinds. i ran out there to hopefully get a sighting..it was a possum. the profiles projected onto shades like a shadow puppet is just like a rat.
i let it go in peace..they eat grubs in my lawn..i hate grubs.