Manhattan jurors were shown gruesome photos Wednesday of a man bludgeoned within an inch of his life at the attempted-murder trial of his Columbia-grad son, who prosecutors say beat and tortured his father with a wrench in a dispute over his late mother’s $2 million fortune.

Jason Heyworth, 37, an amateur filmmaker, beat his father Eric Heyworth, 71, over the course of four hours at his childhood home on East 106th Street on June 9, 2017, prosecutors charge

The elder Heyworth was rushed to Harlem Hospital, where he slipped into a coma, and remained there for two months. He was transferred to a rehabilitation facility and later to an assisted-living home.

Jurors were shown hospital photos Wednesday of the elderly victim’s bloodied face covered in cuts, his eyes purple and swollen shut.

His head was also wrapped in a bandage and his neck in a brace, the photos show.

Gregory Kerr, the attending ICU physician who treated Heyworth, testified that the patient was “Trauma 1,” a designation that put him in the same category as gunshot victims.

“His brain had obvious bruising,” Kerr testified. “There was significant trauma that caused capillaries to release blood…there was a decrease in his mental state. He wasn’t as responsive. He was more lethargic. He couldn’t relate to people.”

The beatdown allegedly happened when Jason showed up to his father’s home that day to try to work out a long-simmering dispute over his mom’s $2 million fortune. Prosecutors allege Jason inherited $1 million after his mother’s death in 2012 — but frittered away the entire sum on “fancy hotels and expensive restaurants” and demanded that his dad give him money and let him move back into the house.

In a bizarre opening statement on Tuesday, Heyworth’s defense attorney claimed the father attacked his client first — and invoked Marvin Gaye’s classic “What’s Going On” to mount his defense.

“In that song, he said, ‘Father, father we don’t need to escalate, you see war is not the answer, only love can conquer hate,’” attorney Todd Spodek said in the opening statement.

“Unfortunately Marvin Gaye had issues with his father, and when he went to see him, he was shot and killed, and when Mr. Heyworth went to see his father to work out issues, he was attacked with a wrench,” Spodek said.