One of the strangest cold cases in Ohio, if not the United States, has now been solved—but pieces of the puzzle remain.

In 2002, a man known as Joseph Newton Chandler III fatally shot himself in the bathroom of his tiny apartment in Eastlake, Ohio. His body wasn't found for a week, by which point it was badly decomposed, and police were unable to obtain fingerprints. He hadn't left a note, and police found more than $80,000 in his bank account. A private investigator, hired by a probate judge to find surviving family members, soon discovered that the man known as Chandler wasn't Chandler at all—he'd stolen the identity of an 8-year-old boy from Tulsa, Oklahoma, who died in a car crash in Texas in 1945.

Since then, rumors have been building. Police felt the man was most likely a fugitive on the run—who else leaves $80,000 in a bank account and hides behind a stolen identity? Some said he might have been a Nazi war criminal. Others thought that he could be the Zodiac Killer, based on his likeness to a police sketch of the infamous murderer who left a trail of terror through Northern California in the 1960s and 1970s. (And, in fact, Chandler was in California at the time of the crimes.) But after the initial round of research following the suicide, the case went cold.

Today, U.S. Marshal Peter Elliott announced that his office and a team of forensic genealogists had cracked the case. Yet they've only solved the first part of the mystery‚ and are appealing to the public for help connecting the rest of the dots.

Their research shows that the man known as Chandler was actually Robert Ivan Nichols of New Albany, Indiana. A Purple Heart Navy veteran who served in World War II, Nichols had disappeared from his family in 1965. He had left his wife and sons the year prior, telling her, "In due time, you'll know why," according to Elliott. In March 1965, he wrote to his parents, saying he was "well and happy" and asking them not to worry about him. The same month, he mailed an envelope to his son Phillip, which contained only a penny. There was no note. It was the last his family would ever hear of him.

According to family lore, the war had taken a heavy toll on Nichols, and he burned his uniforms in the backyard after returning from service. He had no criminal history. Associates who worked with him as "Chandler" described him as a loner, someone who refused to let others get close. Co-workers said he would frequently disappear for days, and even weeks, at a time. He kept a bag packed and ready in his apartment at all times.

After disappearing from his family, he traveled to Dearborn, Michigan, and then to the San Francisco and Richmond, California areas. He assumed the Chandler identity in Rapid City, South Dakota, in 1978, when he applied for a Social Security card using personal information (including the birthdate) of the boy who died in 1945. At the time, such frauds were easier to pull off, since Social Security cards were rarely given to children, and so the real Joseph Newton Chandler III had never been given a Social Security number.

Robert Ivan Nichols circa 1992 Peter Elliott

The break in the case came only after painstaking detective work that involved both sophisticated DNA techniques and pounding the pavement. When Elliott took on the case in 2014 at the request of the Eastlake police, he discovered Chandler had had colon cancer surgery in 2000. He sent tissue samples taken at that time to the local medical examiner, who obtained a DNA profile. Unfortunately, there were no matches between the profile and various national criminal databases.

Stumped, in 2016 Elliott turned to forensic genealogists Dr. Colleen Fitzpatrick and Dr. Margaret Press of California-based IdentiFinders and the DNA Doe Project, a non-profit humanitarian initiative created to help identify Jane and John Does and return them to their families. (Fitzpatrick also helped crack the case of identity thief Lori Erica Ruff in 2016.) Despite a badly degraded sample, they used Y chromosome genealogy to trace a family line that indicated the dead man's last name was likely Nichols or some variation. In March 2018, authorities tracked down a Phillip Nichols in Ohio, who provided a DNA sample. The sample matched with that of the dead man, indicating the pair were father and son. Phillip said at a news conference today that he instantly recognized photos of "Chandler" as his father.

Although the cold case has been solved, mystery remains. Why did Nichols abandon his family? Why did he end his life? What accounts for the rest of his odd behavior? Although it's clear he wasn't a Nazi war criminal, there's still a chance—however slight—that he could be connected to crimes in California, given his residence at the time of the Zodiac Killer's activities. "There has to be a reason he assumed the name of a deceased 8-year-old boy and went into hiding for so many years," Elliott says. When asked about the potential Zodiac Killer connection, Elliott responded, "I can't say for sure that he is, and I cannot say for sure that he's not [the killer]. We have been working with San Francisco, [and the] Department of Justice, but that's a question for them, that's their investigation."

Elliott says he is appealing for the public's help in tracing the rest of Nichols's life and mystery. Tips can be sent to the U.S. Marshals at 216-522-4482.