REDWOOD CITY -- A Redwood City man pleaded not guilty to violently assaulting a 66-year-old hostage and burglarizing her San Mateo home.

Hugo Heduardo Munguia-Hernandez Jr., 20, entered the plea Tuesday on assault, kidnapping, elder abuse, robbery and residential burglary charges stemming from his March 24 arrest, authorities said. A string of leads was reported to police after they released a photo of a man using the woman's ATM card, and a search of Muniguia-Hernandez's home turned up a Taser and stolen property connecting him to the crime.

The woman returned from the grocery store about noon March 21 and found a man burglarizing her Edinburgh Street home, San Mateo County District Attorney Steve Wagstaffe said. The man pulled a Taser on her after being interrupted, stunning her neck, face and arms before gagging her with a sock.

The man then pulled out a handgun and said he would kill the woman and her family and burn her house down if she went to police, Wagstaffe said. The man went on to bind her wrists and ankles and cover her head with a bag, then left her in a closet overnight, Wagstaffe said.

According to Wagstaffe, the man came and went from the home multiple times while the woman sat alone and injured in the closet. During that time, he used her ATM card four times at separate ATMs and stole her TV, wallet and jewelry.

When he was finished ransacking her home, the man forced the woman to take off her clothes and get in the shower so she could wash the tape marks off her face, Wagstaffe said. When he left nearly 24 hours later, on Tuesday morning, the woman was finally able to call police.

Munguia-Hernandez was arrested two days later after multiple callers reported they recognized his surveillance photo in the media, authorities said.

Police will continue to investigate the possibility that Munguia-Hernandez was involved in other burglaries in the area, Wagstaffe said. He remains in jail on no bail status.

Contact Erin Ivie at eivie@bayareanewsgroup.com. Follow her at Twitter.com/erin_ivie.