A reputed gangbanger with three dozen busts on his rap sheet has been charged in the cold-case killing of a Bronx mom who was hit by a stray bullet nearly a decade ago while picking up McDonald’s for her four kids, authorities said.

Jonathan Odenthal, 31, was finally charged with murder eight years after the tragic death of beloved mother-of-four Cindy Diaz, 48, who was fatally shot on Jan. 6, 2017, according to police.

Odenthal was already serving time in federal prison on a drug conspiracy conviction when cops got an NYPD CrimeStoppers tip that helped link him to the long-unsolved case, leading him to get hit with charges Tuesday.

Cindy Diaz was killed in 2017 while walking back from grabbing food for her children. Acquired by: Tomas E. Gaston

Diaz — who had just grabbed food for her four boys at the fast food eatery — was struck in the torso and arm around 5:30 p.m. on Boston Road near East Tremont Avenue in West Farms, police said at the time.

She was rushed to St. Barnabas Hospital but could not be saved.

“She was an innocent person. All she was doing was getting food for kids,” her children’s tearful father, Angel Rosario, told The Post at the time from the family’s 179th Street apartment.

“It’s horrible; it’s a travesty and all for nothing. I bet when we find out what happened, it’s going to be nonsense.”

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Another victim, 18, was shot in the right arm during the burst of violence, police said.

The teen, who a source said had six arrests on his record, was believed to have been the intended target. He was patched up at Jacobi Hospital and then questioned at the 48th Precinct stationhouse, but was uncooperative at the time.

Diaz left behind four sons and a partner. John Curtis Rice

Law-enforcement sources said Odenthal had racked up 36 prior arrests by the time he was eyed in the mom’s nearly decade-old shooting.

Odenthal was among seven alleged members of the 800 YGz gang in the Bronx named on a federal racketeering and conspiracy indictment in 2021.

He was charged along with the crew of peddling drugs in Crotona and scuffling with rival gangs, federal prosecutors said. 

The gang was also charged with fraudulently collecting unemployment benefits during the COVID-19 pandemic, the feds said.

Cops released this surveillance image of the suspect in the shooting.

Odenthal pleaded guilty to racketeering, sending him to prison for 41 months, with records showing he was supposed to remain behind bars until December 28.

He pleaded not guilty through his Legal Aid attorney Wednesday at his arraignment in Bronx Supreme Court on the second-degree murder charge in Diaz’s shooting.

At the time of her death, Diaz’s four boys — Liam, 15, and Takis, 14, who attend St. Raymond High School for Boys in Parkchester, and Reino, 13, and Giavanno, 11, all attended St. Raymond Elementary in East Tremont.

“They got good grades. Why? She sat there with them. She used to study with them — that’s why the kids are bright,” Rosario said at the time. “That was her doing.”

The NYPD and the mayor’s office had previously announced a $20,000 reward for the arrest and conviction of the suspect.

Diaz’s husband and children could not be reached for comment on Wednesday, and their former apartment building is now abandoned and fenced off.

Odenthal was ordered held without bail and is due back in court November 13.

— Additional reporting by Kevin Sheehan and Kyle Schnitzer