A sheriff’s spokesman said officials reassigned an Industry detective to administrative duty after allegations surfaced that he had a Rosemead man arrested to further a relationship with the man’s wife.

Detective Phil Solano remains at the Industry Station pending the outcome of the investigation, said Steve Whitmore, spokesman for Los Angeles County Sheriff Lee Baca.

The probe began in April shortly after the Sheriff’s Department received a complaint, Whitmore said.

“That’s news to me,” Solano said of the investigation. He declined to comment further.

According to court documents, Alberto Gutierrez, 36, was arrested in June 2008 on suspicion of making death threats and violating a domestic restraining order, Solano investigated the case.

In September 2008 Solano arrested Gutierrez on suspicion of violating a restraining order and stalking.

Gutierrez said at the time of his arrests he didn’t know Solano and his wife Mayela Gutierrez knew each other. But, during his April trial, Gutierrez learned that his wife and Solano were Facebook friends. Solano testified under oath that he had “one communication” with Mayela, according to court documents.

Despite the Internet relationship with the suspect’s wife, Solano, a 29-year veteran of the Sheriff’s Department, investigated the case and testified against Gutierrez, according to court documents.