They're the cases that make headline news, but haven't found resolution.

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On Valentine's Day in 2014, 17-year-old J.R. Isack was struck by a car while crossing the road along Ypaopao Estates in Dededo. The hit-and-run killed Isack, who suffered significant head trauma. A week after his death, the Federated States of Micronesia community held a candlelight vigil in his honor. Still no arrests were made in this case.

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In July 2014, 62-year-old Nicolas Reyes Tolentino was discovered dead in his hair salon at the Hafa Adai Exchange. Tolentino's daughter found his body in a pool of blood - her screams audible by neighboring store owners who also rushed to the scene.

According to the island's chief medical examiner Dr. Aurelio Espinola, Tolentino died from multiple stab wounds.

The only leads were witness accounts stating that about five to six individuals were sitting on the ground across from the Tolentino's Beauty Salon consuming alcohol the night before he was found dead

No arrests were ever made in this case.

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November 2014 - a homeless man, later identified as 29-year-old Isak James was found dead in Harmon. According to the autopsy, James died of blunt force trauma to the abdomen, chest, and back.

Although James was homeless, he was last seen in the village of Asan the week prior.

No arrests were made in the case.

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February 2015 - 46-year-old Kenster Ehder was reported missing before he was found dead along Route 1 in Upper Tumon near the iConnect building.

The medical examiner ruled injuries were a result of physical assault.

No arrests were ever made in connection to this case.

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Although not a Guam Police Department investigation, we should note another mystery never found closure. Back in December 2014 24-year-old Airman Alec Dye's remains were uncovered near Tarague Beach days after he was reported missing.

Dye was deployed to Guam from Barksdale Air Force Base in Louisiana.

According to the medical examiner, the remains were "only bones" and provided little to no information as to what events unfolded at the beach.

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June 2015 - 37-year-old Melissa Diego was transported from her Inarajan home to naval hospital for what appeared to be a gunshot wound to the upper part of her body.

Although the findings of her autopsy were not released, the Guam Police Department re-classified the investigation from a death investigation to a homicide investigation.

Still no arrests have been made in this case.

Anyone with information regarding any of these unsolved cases is urged to call the Guam Crimestoppers at 477-HELP (4357).