Christianson didn't say when the 33-year-old came to the US but said that the Mexico native has been living here for several years.
"Please remember the man", Richardson also said.
Christianson called for stricter laws at a news conference as Singh's brother wept beside him. Corporal Singh leaves behind a wife and five month old son.
"But there are a lot of people out there that miss him and a lot of law enforcement people, that I don't know, who worked day and night to make this happen". Incensed by the tragedy, members of Congress introduced Kate's Law, which would mandate up to 10 to 25 years in prison for illegal immigrants in the US with a criminal history who had been previously deported.
Investigators said on Friday that Arriaga was arrested at a home in Bakersfield during the execution of a search warrant. The profile picture shows him smiling as he stands at a patrol vehicle with a dog - the same photograph of the officer released by the Sheriff's Department.
President Trump addressed the manhunt on Twitter on Thursday, noting that this is another example why the country needs to take a tough stand on border security.
It was not immediately clear if Arriaga, who was transported in Singh's handcuffs from Bakersfield to Stanislaus County, had an attorney.
Ronil Singh was shot. "That's what we need to get back to, is community, that small town feeling, and let it grow".
Singh, 33, was a Fiji native who entered the country legally, was a member of the Newman Police Department since July 2011.
President Donald Trump used the shooting and Arriaga's status to push his immigration policies. "Yes he was a police officer but more importantly he was a human being". According to authorities, the suspect is in the country illegally.
Christianson also announced that two other men, Adrian Virgen, 25, Erik Razo Quiroz, 27, were arrested Thursday for helping Arriaga escape after he allegedly shot and killed Cpl. The Stanislaus County Sheriff's Department shared images of the suspect from a convenience store, in the hopes that someone would recognize him.
Lawmakers who supported the California state law have said that undocumented immigrants are more likely to report crimes and cooperate with law enforcement if they do not fear deportation for themselves or others.
He called Singh a "true American patriot". "This is a man that I relieved on Christmas Day so he could go home and spend some time with his family and his newborn child".
He was a reserve officer for the Merced County Sheriff and worked as an animal control officer in Turlock before he joined the Newman force.