The FBI has joined the search for a missing Southern California grandfather as authorities escalate what is now being treated as a kidnapping investigation tied to a troubling web of fraud, impersonation and possible targeting linked to cryptocurrency wealth.
Nai Ping Hou, 74, vanished in March 2025 from his Rancho Cucamonga home and was reported missing weeks later on May 4.
Hou’s son Wen Hou said the last time he saw his father was during a fishing trip in March, just days before he disappeared.
"He was in a very good mood," purchases of gold and cryptocurrency.
"His money was also gone," Wen Hou said. "Funds were being transferred out to purchase gold online. He’s not tech-savvy at all, so I don’t know how he could’ve done any of that himself."
Authorities say Hou’s vehicles were also sold and there was an apparent attempt to rent out his home.
Hou’s wife was out of the country visiting family in China at the time he vanished and received unusual messages from his phone, including one suggesting she delay returning home.
While investigators have not confirmed a motive, the family has told KABC they fear Hou may have been targeted because of their financial success in cryptocurrency. Wen Hou is a hedge fund executive who has invested heavily in the space.
"I miss him dearly," Wen Hou said. "He’s always been a guiding presence in my life."
"We’re really worried, and we really want my dad back," he added.
Hou is described as 5 feet 7 inches tall and about 170 pounds, with dark hair and a birthmark on his upper left shoulder. He also has a surgery scar on his lower back. He has not been seen or heard from since March 2025.
Investigators are also seeking information about a silver Toyota Yaris believed to be connected to the case.
The Hou family has launched a dedicated website to raise awareness, share photos and collect tips. The site includes a video message in which Wen Hou makes an emotional plea for his father’s safe return.
A reward of up to $250,000 is being offered for information leading to Hou’s safe return or the arrest of those responsible.
Authorities urge anyone with information to contact the San Bernardino County Sheriff’s Department or the FBI.