Gary Gene Grant is an American serial killer who raped and murdered four teenagers in Renton, Washington between 1969 and 1971. At the time of the killings he was only 18 years old, with three of his victims being children under the age of 17. On August 25, 1971, Grant was convicted of murder and sentenced to life imprisonment. He denied his guilt in the crimes, claiming insanity.

Grant's trial began on August 12, 1971. The main pieces of evidence incriminating him were an audio recording of his confession, a blood-stained knife and imprints from his tennis shoes, the size and treads of whose soles matched the shoes Grant was wearing at the time of his arrest. During subsequent hearings, a number of acquaintances acted as witnesses for the prosecution, telling the jury that they had seen Gary on the days of the murders near the crime scenes, and that he had dirty clothes. Gary's lawyers, in turn, insisted on their client's insanity and demanded leniency. His close friends and father acted as witnesses for the defense, stating that since childhood Grant was a passive, harmless individual. At the request of his defense team, a forensic psychiatric exam was conducted to evaluate Grant's mental health. Based on the results from said exam, he was found to be sane, although the psychiatrist noted that Gary was impulsive, had problems controlling himself and often acted out emotionally in high-stress situations. He also suggested that the crimes were his way of escapism, used as a way to vent his frustrations at unresolved personal issues. After a two-day meeting on August 25, the jury verdict was announced: Gary Grant was found guilty on all counts, and was sentenced to four life imprisonment terms without the chance of parole.

Since his conviction, Gary Grant has spent the rest of his years imprisoned at various penitentiaries scattered across the state. In 2020, he received a second wave of infamy after author Cloyd Steiger published his book "Seattle's Forgotten Serial Killer: Gary Gene Grant", which revealed new details about the case. As of 2021, Grant is alive and serving his sentence at the Monroe Correctional Complex.

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