Might be a mountain lion . . .
. . . as one was killed while it lounged in a neighbor's yard this last spring, just three houses down the street. Had suspcions 'bout that episode: a heavy trail through some ground cover after hearing heavy footfalls on the gravel early in the morning; and, "our" feral cat spending a spring night under our bed. The next day I heard the shots. They had to, sad as it was, kill the cat. It was noon, the young male cat was hanging out in a fenced backyard, and when the wildlife officers approached it didn't run, just gave them a cold stare. A sign of a cat in it's territory. Guess you can't have that inside city limits.
One of my suspicions is that the cat spent the other night under our bed.