The slain corporal started his law enforcement career in Merced, and the vehicle the man suspected of killing him was driving was sold in town, and the folks who made the deal remember the buyer.
Highway signs all over the state asked drivers to call 9-1-1 if they saw the suspect's vehicle.
The grey Dodge pickup with a paper dealer tag for a license plate that said AR Sales was found Wednesday afternoon.
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The car dealer is in Merced and investigators from the District Attorney's office have searched their records.
"They came in this morning about 9:30 a.m. we gave them the documents we had, tried to help out as much as we can," said Jameel Taha, owner of AR Sales.
Taha told Action News since it was a cash deal there weren't a lot of records.
"It was under $10,000 so we didn't really need too much documents from them.
VIDEO: 'Please remember the man': Police chief gives emotional statement, calling slain Newman Cpl. Ronil Singh an 'American patriot'
We do have a name and address but the name and address was not the person that committed the crime on there, this was the brother bought the truck," Taha said.
But salesman Adam Nasser saw the surveillance picture and recognized the suspect as being the brother of the man who bought the truck and said he who accompanied him to the car lot.
"They both came in, to purchase the truck, normal family, normal sale, came in with their kids. Just normal sale, like every day," Nasser said.
The dealership gave the name and address to law enforcement.
Corporal Ronil Singh had been on the Newman Police force for 7 years. His first job in law enforcement was as a reserved deputy on the Merced County Sheriff's Department.
RELATED: Witness recalls hearing several gunshots, vehicle speeding off after officer was shot
"He started off his career here in 2010 as a reserve deputy sheriff, and apparently his heart and soul was in the community of Newman, and left here to become a full time peace officer with them. That's how he got his start," said Sheriff Vern Warnke.
Sheriff Warnke didn't know Singh but feels the loss of a fellow officer.
"Tragedy, there's just no other words to explain this, we are doing what we can but as a law enforcement community, this it's just tragic.
The Merced County Sheriff's Department has dispatched 8 deputies and investigators to Stanislaus County to aid in the investigation.
Take a look at the latest stories, videos and updates on the shooting death of Corporal Ronil Singh.