On November 19, 2018, 17-year-old Yaleah Hall was found shot to death in the basement of a house on Malcolm Street in Southwest Philadelphia. She was one of four people killed there that day; also shot in the head were her 20-year-old sister Tiyaniah Hopkins and two men, 31-year-old William Taylor and 28-year-old Akeem Mattox. Police described the slayings as execution-style and said there were no signs of a struggle, with victims apparently led to the basement before being shot.

Investigators say the killings grew out of a drug deal gone wrong. Taylor and Mattox had been renovating the home, found a stash of drugs and attempted to sell them; authorities believe the suspects intended to rob the men of those drugs and that the two sisters were innocent bystanders. Several suspects were charged, including Jahlil Porter, Keith Garner, Robert Long and Nasir Moss-Robertson. Robert Long later pleaded guilty, and Porter and Garner were sentenced to lengthy terms, with court statements noting the defendants had been friends of the male victims and that the sisters were not involved.

Did anyone in the neighborhood see unusual activity around the Malcolm Street house in the days before November 19, 2018?