WASHINGTON — Sheriff’s deputies in Lake County, Fla., on Monday arrested a notorious tormentor of the parents of Sandy Hook Elementary School shooting victims, charging him with the unlawful possession of personal identification.

Wolfgang Halbig, a former contributor to Infowars, the online and radio show hosted by the far-right provocateur Alex Jones, has spread false claims for years that the Dec. 14, 2012, shooting of 20 first graders and six educators in Newtown, Conn., was an elaborate government hoax aimed at confiscating Americans’ firearms. When challenged or confronted by Sandy Hook families, Mr. Halbig has released their personal information, taunted them or emailed them photographs of what he claimed were their dead children “all grown up.”

Mr. Halbig, of Sorrento, Fla., was arrested after a complaint filed by Leonard Pozner, whose son Noah, 6, died in the shooting. The arrest affidavit said that Mr. Halbig repeatedly emailed Mr. Pozner’s Social Security number, date of birth and other information to a long list of recipients, including “multiple different law enforcement agencies and news stations.”

Mr. Pozner has tried since 2014 to stop Mr. Halbig from targeting Sandy Hook families and other victims of tragedy. In response, Mr. Halbig posted online a 100-page TransUnion background report on Mr. Pozner, which included his address and delicate personal information. Mr. Pozner lives in hiding.