I vacillate on this. It's possible, but, unless someone is a really poor house-keeper who never vacuums or sweeps or cleans things, it seems unusual for their hair to be left on 3 of 4 victims' bodies.
"A hair found with Brainard-Barnes’ remains is genetically similar to a DNA sample taken from Heuermann’s ex-wife."
Article was from before Rex arrest for 4th murder.
To recap:
"According to the court filing, on or about June 12, 2023, the forensic lab compared the mitochondrial DNA from the pizza and the hair and determined that the "DNA profile(s) are the same" — specifically that 99.96% of the North American population would be excluded as matches to the hair.
"It is significant that (Heuermann) cannot be excluded from the male hair recovered near the 'bottom of the burlap' utilized to restrain and transport Megan Waterman's naked and deceased body," prosecutors wrote.
Retesting hair samples
Authorities recovered hairs found with each of the victims, which were too degraded to test for DNA with the techniques available at that time. But the technology improved, Tierney said, and investigators were able to test the hairs with more advanced methods.In July 2022, 11 bottles were collected from a trash can outside of the Heuermann home and sent for mitochondrial DNA testing. DNA profiles generated from the bottles were tested against previously tested hair samples recovered on the remains of Megan Waterman and Amber Costello. Results found that Heuermann's wife could not be excluded from either of the female hairs recovered on the remains of Waterman and Costello. The hair was believed to have been transferred from her husband's clothing. Heuermann's wife was out-of-state at the time of each of the murders, according to the court filing. She has not been charged.'

"Avalanche" of evidence: How a Chevy, a strand of hair and a pizza box led police to the Gilgo Beach suspect
Investigators re-examined old clues that led to the suspect and developed new evidence to close in on him after so many years, say prosecutors.

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