PLACENTIA The last of four men charged with murdering a 35-year-old Placentia resident in an armed robbery gone wrong was arrested this week after three months on the lam, police said.

Augustin Velasquez, 20, from the Anaheim area, was arrested without incident between Thursday afternoon in Buena Park after being pulled over, said Placentia Sgt. Bryce Angel. Detectives were following up on leads and saw him drive away from a location they were watching in a relative’s car.

Velasquez and three others are accused of fatally shooting Robert Rios around 11:40 p.m. on Jan. 19 at his house in the 900 block of Vista Avenue. in Placentia.

Charles Coghill, 33, was arrested in Fullerton on April 6, Angel said. He has since pleaded not guilty. Ricardo Valenzuela, 37, and Israel Cordova, 31, were already in Orange County Jail on unrelated charges when they were charged in Rios’ murder.

All four were charged with special-circumstances murder several weeks ago, court filings show, meaning they could face the death penalty if convicted. They were also charged with first-degree burglary.

Surveillance video released in early March show three men carrying rifles walking through a front gate and into the yard of the Vista Avenue house. They then appear to get into an argument with someone. The men, who continually exit and enter the frame, then hastily flee, the video shows.

The men had gone there to steal from Rios, Angel said. “They knew him and targeted him. But he fought back, and a struggle ensued.”

The suspects didn’t take anything because the shooting scared them off, Angel said. The murder weapons have not been found. The four suspects are from different gangs but were working together, Bryce said.

Staff Writer Sean Emery contributed to this report.