WATCH: Suspect in drive-by shooting of 3-year-old swears at cameras during arrest

(SBG San Antonio photo)

Police have arrested a suspect in the death of a 3-year-old who was killed in a drive-by shooting on the South side more than a month ago.

Rene was killed while riding in the back of his family car on Nov. 4 after someone opened fire near Briggs and New Laredo Highway. The family took him to Southwest General Hospital for treatment, but he was later airlifted to University Hospital where he died of his injuries.

WATCH: Suspect swears at news cameras and claims innocence during arrest.

A tip is what first led officers to the suspect. Further investigation, and what McManus said was "very, very good evidence," led officers to arrest 22-year-old Eric Treviño Wednesday afternoon at the 3200 block of Cupples Road.

"I made a promise to Mrs. Blancas when this shooting first happened that we would make an arrest in this case and today we kept our promise," Chief William McManus said.

Treviño had five outstanding felony warrants and two outstanding misdemeanor warrants.

“I can’t even imagine why someone would want to do this to us, let alone kill my baby boy," Rene Blancas, Sr. previously said.

VIDEO: Police detail the investigation leading up to the arrest.

Rene's mother told police her son was in the backseat next to his 11-month-old sister when the Trevino's vehicle drove by slowly and completed a u-turn. The driver pulled in behind them and fired a single shot, striking the backseat and hitting Rene in the back of the head according to an arrest affidavit.

Surveillance video revealed the suspect vehicle fleeing south on Bynum Avenue. A news tip detailed the the direction of flight and direction of the suspects' vehicles, leading to Trevino's arrest.

The car involved in the drive-by belong to Trevino's parents. It was returned to the dealership five days after the shooting.

Police tracked it down and checked it for evidence.

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