A man suspected of killing an 18-year-old Morgan Hill woman last week was arrested at the Mexico-California border, police said Monday.

Authorities arrested Martin Mendoza at the border as he was reportedly coming back into the U.S., according to Morgan Hill police.

Marissa DiNapoli was found dead Wednesday, two days after she was reported missing.

Her family last heard from her June 28 when she texted them at 9:16 p.m., saying she planned to stay with a friend and would return home the following day.

Her family contacted police after they didn’t hear from her again.

Martin Mendoza is considered a person of interest in the death of Marissa DiNapoli, 18, who was found dead Wednesday, July 2, 2025, four days after she was last seen alive leaving a home on Trail Drive in Morgan Hill with a man matching Mendoza’s description. Mendoza was arrested Monday near the U.S.-Mexico border. (Morgan Hill Police Department via Bay City News)

Detectives determined DiNapoli was last seen alive at approximately 9:45 a.m. Saturday with a man named Martin Mendoza. They were seen leaving a residence on Trail Drive, just outside the Morgan Hill city limits. DiNapoli’s car was later located in the same area.

A police spokesperson deferred questions surrounding the circumstances of the arrest, including when it happened, to later Monday afternoon. A Morgan Hill police statement Monday morning said multiple law enforcement agencies were involved.

‘Our hearts remain broken’

Morgan Hill Mayor Mark Turner released a statement on Monday, saying “While Martin Mendoza’s capture does not bring Marissa back, it is a crucial step toward justice and healing for her family and friends. Our hearts remain broken for Marissa’s loved ones, and we will continue to keep them in our thoughts and prayers.

“I urge everyone in our community to respect the ongoing investigation and allow law enforcement officials to do their job, ensuring that every aspect of this case is handled thoroughly and properly.”

“While Martin Mendoza’s capture does not bring Marissa back, it is a crucial step toward justice and healing for her family and friends.” Mayor Mark Turner

There will be a community grief and healing circle in honor of DiNapoli at 6 p.m. Tuesday in the El Toro Room of Morgan Hill Community Cultural Center. Police said this safe and supportive space will be facilitated to guide shared reflection and healing, honoring DiNapoli’s’s life and providing comfort to those grieving.

Anyone with information about the case can contact Detective Kyle Tolentino at (669)-253-4962. Anonymous tips can also be submitted online or by calling (800) 222-TIPS.