Sandra Merritt appeared in a Houston courtroom and posted bond, which was reduced from $10,000 to $2,000. The other indicted activist, David Daleiden, was scheduled to turn himself in Thursday.
Both are charged with tampering with a governmental record, a felony punishable by up to 20 years in prison. Daleiden also was indicted on a misdemeanor count related to purchasing human organs that carries up to a year in prison. Their attorneys have said the two activists plan to plead not guilty.
Warrants had been issued for Merritt and Daleiden's arrests following their indictments on Jan. 25. But the activists' attorneys had made arrangements with authorities to have them voluntarily come from California, where they live. State records show Merritt lives in San Jose, has operated a tutoring business and has held a cosmetology license since 1982.
Harris County District Attorney Devon Anderson's office initially launched the grand jury investigation to look into Planned Parenthood after the undercover videos claimed that the nation's largest abortion provider illegally sold fetal tissue to make a profit.
The grand jury cleared Planned Parenthood of misusing fetal tissue, opting instead to indict Daleiden and Merritt, who made the videos and are accused of using fake driver's licenses to get into a Houston clinic.
The video footage showed them posing as representatives of a company called BioMax, which purportedly procured fetal tissue for research. Planned Parenthood has said the fake company offered to pay the "astronomical amount" of $1,600 for organs from a fetus. The clinic said it never agreed to the offer.
The activists' attorneys have acknowledged the two used fake driver's licenses but that their actions weren't meant to defraud or harm the abortion provider, and that they never intended to buy human organs.
Defense attorneys also said the charges won't stand up in court and have asked Anderson to drop the case and resubmit the evidence to another grand jury on possible charges against Planned Parenthood.
Anderson has said that she won't resubmit the case because she respects the grand jury's decision "even if it conflicts with my personal beliefs," which Anderson described as "pro-life."