Constable Alan Rosen with Harris County Precinct 1 tweeted a picture of Paul David Cole, a registered sex offender, in handcuffs.
Cole was arrested after multiple witnesses in The Heights reported him for flashing.
"I was walking my dog, saw the red bicycle, and I thought immediately about what I read on Nextdoor," said one woman, who saw the flasher but did not want her name used. "I ran away quickly."
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More than a dozen people have commented on various sightings of the flasher on Nextdoor posts since mid-December.
"We have had multiple reports coming in through Nextdoor, talking about a man between 50-70 years old on a red bicycle," confirmed Constable Rosen.