On April 8th, 2016, fire crews were sent to a home on Mesarica Road in Covina, California. Smoke was seen coming from the roof and it seemed isolated to one area. When firefighters entered, they found the body of 89-year-old Helen Lambert. Her heavily charred body was on a bed and her wrists tied up. Investigators determined that Lambert didn’t die from the fire but most likely died from a very unusual circumstance. The woman lived with her teenage grandson who was at school when the fire happened. A neighbor who was also Lambert’s caregiver is the one who called 911. Who would tie up a grandmother, ignite a fire in her bedroom, and leave her for dead? And what was the motive? Los Angeles County Sheriff’s Detectives Shaun McCarthy and Rich Tomlin debrief us on the investigation.