On April 27, 1964, a one-day old infant, Paul Joseph Fronczak was kidnapped from Michael Reese Hospital in Chicago, Illinois.
The original 1964 kidnapping victim was found alive in Michigan in 2019, now named Kevin Ray Baty.
The investigation was the largest manhunt in Chicago history up to that point, involving 175,000 postal workers, 200 police officers, and the FBI.
[1] On July 2, 1965, a male toddler with a black eye, later known to be Jack Rosenthal, was found abandoned in a pushchair in a busy shopping center in Newark, New Jersey.
Their meeting ended and Paul returned home to Las Vegas, then his parents changed their minds and told him by phone that they did not want him to send in the DNA kit.
He later received a phone call from IdentiGEN, and the caller told him there was "no remote possibility" that he was his parents' biological child.
A group of genealogist volunteers called the DNA Detectives offered to take up his case free of charge in 2013.
On June 3, 2015, the group told Fronczak that they had identified him as Jack Rosenthal of Atlantic City, New Jersey, who had seemingly vanished in 1965.
Gilbert was described as "an angry man" after returning from the Korean War with PTSD, and Marie was described as a heavy alcoholic.
Fronczak said that he believes Jill may have been killed or "something tragic" may have happened to her, and that his parents then decided to get rid of him because "they couldn't explain just one twin".
Before his death, he spoke multiple times on the phone with his biological mother, Dora Fronczak, but they were never able to meet in person.