This is an excerpt from our true crime newsletter, Suspicious Circumstances, which sends the biggest unsolved mysteries, white-collar scandals and captivating cases straight to your inbox every week. Sign up here .

Surveillance footage has become a crucial element of modern criminal investigations, and cases often hinge on video evidence. But several high-profile murder cases remain unsolved despite investigators finding and publicly sharing video of a prime suspect.

Case in point: It seemed like a slam-dunk for investigators when they linked not only DNA of a Maryland womans alleged killer to a suspect in a Los Angeles home invasion they also had doorbell video of the suspect leaving the crime scene.

Despite that video, alongside widely shared flyers about the crimes, six months have passed without a witness to identify the man suspected of killing Rachel Morin, a 37-year-old mother of five whose body was found on a hiking trail last summer.

Six months after Morins killing, authorities last week released additional sketches of the suspect, hoping it will finally lead to a break in the case. But as it stands, Morins killing joins a number of baffling murder cases that remain unsolved despite video evidence of a suspect near a crime scene or even of the killing itself.