Police arrested a 31-year-old man after he walked into a Long Beach Police Department building with his attorney, who identified him as the suspect in the shooting death of 46-year-old Nancy Romero, authorities announced today.

John Osborne, a Long Beach resident, was booked in the Long Beach jail on suspicion of murder shortly after 4:10 p.m. on Tuesday.

“The investigation revealed suspect Osborne and victim Nancy Romero were involved in a dating relationship,” police said in a release. “Detectives believe the murder to be an isolated incident of domestic violence.”

Police began a search for Osborne after Romero was found lying on a sidewalk with a gunshot wound about a block away from the Long Beach courthouse around 8 a.m. on July 11. Paramedics took her to a local hospital where she died, authorities said.

Police and SWAT swarmed the neighborhood at Third Street and Daisy Avenue hours later to serve a search warrant at a home. After they made entry to the residence, they discovered no one was inside.

Detectives revealed little information on the case in the days after her death, only that Romero knew the man who shot her.

Detectives will present their case to the Los Angeles District Attorney’s office later this week, the news release said. Osborne is being held on a $2 million bail.