James Lewis, prime suspect in unsolved 1982 Tylenol murders case, dies at 76

The sole suspect investigators believed was responsible for the 1982 Tylenol murders in Chicago has died, police said Monday.

James Lewis, 76, who was never charged in the seven murders, was the only person law enforcement targeted as a suspect for more than 40 years.

Police in Cambridge, Massachusetts, confirmed that the police department and EMS workers responded to Lewis' suburban Boston home for a call of an unresponsive person Sunday afternoon. He was later declared dead.

"Following an investigation, Lewis’ death was determined to be not suspicious," the police department said.

Seven people ages 12 to 35 were killed in the Chicago area after they ingested extra-strength Tylenol capsules laced with cyanide. Lewis, who was in his 30s at the time, denied any involvement.