prowler

noun

1. One who roves about for prey; one who prowls.

   “House Prees and Bloods […] were everywhere to be seen in earnest colloquy. For the matter was, that there was some sort of night-prowler about the school grounds.”

2. A person who moves stealthily around a place with intention to commit a crime, especially burglary or theft.

   “Discourage nighttime prowlers by installing motion-sensitive lights.”

   ““I was under the impression that a prowler had broken in and killed my baby. Never did they say that it was a deputy-involved shooting until my brother read it on the internet,” Wilburn said.”